Small for gestational age and early childhood caries: the BRISA cohort study.

This study tests the hypothesis that children 12-30 months born small for gestational age (SGA) aged are more susceptible to severe early childhood caries (S-ECC). We used data on 865 children aged 12-30 months from a prospective cohort study conducted in a city in the northeast of Brazil. The study outcome was S-ECC, defined based on the proportion of decayed tooth surfaces (cavitated or not). The main exposure variable was SGA, defined according to the Kramer criterion and the INTERGROWTH-21st standard. Direct (SGA → S-ECC) and indirect effects were estimated using structural equation modeling, calculating standardized factor loadings (SFL) and P-values (alpha = 5%). The final models showed a good fit. SGA influenced S-ECC in the direct and indirect paths. In the group of SGA children with 12 or more erupted teeth defined according to the Kramer criterion, the direct effect was positive (SFL = 0.163; P = 0.019); while among all SGA children defined according to the INTERGROWTH-21st standard, the direct effect was negative (SFL = - 0.711; P < 0.001). Age and number of erupted teeth may influence the occurrence of S-ECC in SGA children, as the number of teeth affects the time of exposure to disease risk factors.

RANTES and developmental defects of enamel in children: A Brazilian prenatal cohort (BRISA).

OBJECTIVE: Little is known about the effect of maternal immunological factors on the etiology of developmental defects of enamel (DDE). RANTES (Regulated on Activation Normal T Cell Expressed and Secreted) is a chemokine produced by fibroblasts, lymphoid and epithelial mucosa cells in response to various external stimuli. Despite its importance for embryogenesis, RANTES expression has been demonstrated in multiple diseases characterized by inflammation, tumor and immune response, and wound healing. We hypothesized that altered levels of RANTES during pregnancy are associated with the immune and inflammatory response in women, which could lead to the occurrence of DDE in utero (DDE-iu), directly or mediated by preterm birth. Therefore, this study aimed to evaluate the direct and indirect effects of serum levels of RANTES in pregnant women in the occurrence of DDE-iu in children. METHODS: This is a longitudinal case-control study. The mothers and their children (327) were evaluated in three moments: prenatal care, post childbirth, and when the child was between 12.3 and 36 months of age. The analysis was performed with structural equation modeling, estimating the standardized coefficient (SC), adopting α = 5%. RESULTS: There was a direct and negative effect of RANTES on the outcome (SC = -0.137; p = 0.022). This association was not mediated by preterm birth (SC = 0.007; P = 0.551). When considering the specific types of DDE-iu, RANTES had a direct effect on hypoplasia (SC = -0.190; p = 0.007), but not on opacity (SC = 0.343; p = 0.074). CONCLUSION: Lower serum levels of RANTES may contribute to a higher number of teeth with DDE-iu, specifically hypoplasia. However, more evidence supported by clinical, laboratory and epidemiological studies is still needed.

[Do depressive symptoms, anxiety and stressful symptoms during pregnancy affect gestational weight gain?] / Sintomas depressivos, ansiedade e os sintomas estressantes durante a gravidez afetam o ganho de peso gestacional?

The scope of this article is to estimate the effects of symptoms of mental disorders during pregnancy (depressive symptoms, anxiety and stress) on gestational weight gain (kg). It is a longitudinal study, carried out with data from the BRISA Birth Cohort, which was launched in 2010 in São Luís, Maranhão. Gestational weight gain was classified according to the Institute of Medicine. The independent variable was a construct (latent variable) referred to as symptoms of mental disorders, made up of the depressive symptoms, anxiety and stressful symptoms variables (all on an ongoing basis). Structural equation modeling was used to investigate the association between mental health and weight gain. Regarding the association between symptoms of mental disorders and weight gain during pregnancy, no total effect was found (PC=0.043; p=0.377). Regarding indirect effects, no effect was found either through risk behaviors (PC=0.03; p=0.368) or through physical activity (PC=0.00; p=0.974). Finally, the data did not show a direct effect of symptoms of mental disorders during pregnancy such as gestational weight gain (PC=0.050; p=0.404). Gestational weight gain had no direct, indirect or total effect on symptoms of mental disorders in pregnant women.

O objetivo deste artigo é estimar os efeitos dos sintomas de transtornos mentais na gravidez (sintomas depressivos, ansiedade e estresse) no ganho de peso gestacional. Estudo longitudinal, realizado com dados da Coorte de nascimento BRISA, iniciada em 2010 em São Luís, Maranhão. O ganho de peso gestacional foi classificado de acordo com Institute of Medicine. A variável independente foi um construto (variável latente) nomeado de sintomas de transtornos mentais, englobando as variáveis sintomas depressivos, a ansiedade e os sintomas estressantes (todas de forma contínua). Utilizou-se modelagem de equações estruturais, a fim de investigar a associação entre a saúde mental e ganho de peso. Em relação a associação entre sintomas de transtornos mentais e ganho de peso na gestação, não se encontrou efeito total (CP=0,043; p=0,377). Em relação aos efeitos indiretos, também não se encontrou efeito através dos comportamentos de risco (CP=0,03; p=0,368) e através da atividade física (CP=0,00; p=0,974). Finalmente os dados não evidenciaram efeito direto dos sintomas de transtornos mentais durante a gravidez como o ganho de peso gestacional (CP=0,050; p=0,404). O ganho de peso gestacional não apresentou efeito direto, indireto e total nos sintomas de transtornos mentais de gestantes.

Sintomas depressivos, ansiedade e os sintomas estressantes durante a gravidez afetam o ganho de peso gestacional? / Do depressive symptoms, anxiety and stressful symptoms during pregnancy affect gestational weight gain?

Resumo O objetivo deste artigo é estimar os efeitos dos sintomas de transtornos mentais na gravidez (sintomas depressivos, ansiedade e estresse) no ganho de peso gestacional. Estudo longitudinal, realizado com dados da Coorte de nascimento BRISA, iniciada em 2010 em São Luís, Maranhão. O ganho de peso gestacional foi classificado de acordo com Institute of Medicine. A variável independente foi um construto (variável latente) nomeado de sintomas de transtornos mentais, englobando as variáveis sintomas depressivos, a ansiedade e os sintomas estressantes (todas de forma contínua). Utilizou-se modelagem de equações estruturais, a fim de investigar a associação entre a saúde mental e ganho de peso. Em relação a associação entre sintomas de transtornos mentais e ganho de peso na gestação, não se encontrou efeito total (CP=0,043; p=0,377). Em relação aos efeitos indiretos, também não se encontrou efeito através dos comportamentos de risco (CP=0,03; p=0,368) e através da atividade física (CP=0,00; p=0,974). Finalmente os dados não evidenciaram efeito direto dos sintomas de transtornos mentais durante a gravidez como o ganho de peso gestacional (CP=0,050; p=0,404). O ganho de peso gestacional não apresentou efeito direto, indireto e total nos sintomas de transtornos mentais de gestantes.

Abstract The scope of this article is to estimate the effects of symptoms of mental disorders during pregnancy (depressive symptoms, anxiety and stress) on gestational weight gain (kg). It is a longitudinal study, carried out with data from the BRISA Birth Cohort, which was launched in 2010 in São Luís, Maranhão. Gestational weight gain was classified according to the Institute of Medicine. The independent variable was a construct (latent variable) referred to as symptoms of mental disorders, made up of the depressive symptoms, anxiety and stressful symptoms variables (all on an ongoing basis). Structural equation modeling was used to investigate the association between mental health and weight gain. Regarding the association between symptoms of mental disorders and weight gain during pregnancy, no total effect was found (PC=0.043; p=0.377). Regarding indirect effects, no effect was found either through risk behaviors (PC=0.03; p=0.368) or through physical activity (PC=0.00; p=0.974). Finally, the data did not show a direct effect of symptoms of mental disorders during pregnancy such as gestational weight gain (PC=0.050; p=0.404). Gestational weight gain had no direct, indirect or total effect on symptoms of mental disorders in pregnant women.

[Cesarean section and association with intelligence quotient in adolescents: contribution from the RPS Cohort Consortium (Ribeirão Preto, Pelotas and São Luís), Brazil]. / Nascer de cesariana e associação com quociente de inteligência em adolescentes: contribuição do Consórcio de Coortes RPS (Ribeirão Preto, Pelotas e São Luís), Brasil.

This study aimed to evaluate the association between cesarean section and intelligence quotient (IQ) in adolescents from the Municipality of São Luís, Maranhão State, Brazil. This is a longitudinal study using data from the São Luís birth cohort, started in 1997. The approach occurred in the third phase of the cohort, in 2016, with adolescents aged 18 and 19 years. The exposure variable was mode of delivery and the outcome variable was IQ, measured by applying the third version of the Wechsler Adult Intelligence Scale (WAIS-III). In the data analysis, the average IQ was verified according to the covariates and multivariate linear regression was used. To control confounding factors, a theoretical model was elaborated using the directed acyclic graph. The confounding variables were socioeconomic variables at birth and perinatal variables. Their average IQ was 101.4. In the crude analysis, the IQ of adolescents born by cesarean section was 5.8 points higher than those born by vaginal delivery (95%CI: 3.8; 7.7, p ≤ 0.001), with statistical significance. In the multivariate analysis, the value decreased to 1.9 (95%CI: -0.5; 3.6, p = 0.141), without statistical significance. The result of the study showed that cesarean section is not associated with the IQ of adolescents in this sample and reflects that the differences can be explained by other factors, such as socioeconomic and perinatal aspects.

O objetivo do estudo foi avaliar a associação entre a cesariana e o quociente de inteligência (QI) em adolescentes do Município de São Luís, Maranhão, Brasil. Trata-se de um estudo longitudinal utilizando dados da coorte de nascimento em São Luís, iniciado no ano de 1997. A abordagem ocorreu na terceira fase da coorte, em 2016, com adolescente aos 18 e 19 anos de idade. A variável de exposição foi a via de nascimento e a variável de desfecho foi o QI, mensurada a partir da aplicação da terceira versão da Escala de Inteligência Wechsler para Adultos (WAIS-III). Na análise dos dados verificou-se a média do QI segundo as covariáveis e utilizou-se a regressão linear multivariada. Para controlar os fatores de confundimento foi elaborado um modelo teórico utilizando o gráfico acíclico dirigido. As variáveis confundidoras foram as socioeconômicas no momento do nascimento e as variáveis perinatais. A média do QI dos adolescentes foi 101,4. Na análise bruta, o QI dos adolescentes nascidos de cesariana foi 5,8 pontos maior em relação aos nascidos de parto vaginal (IC95%: 3,8; 7,7, p ≤ 0,001), com significância estatística. Na análise multivariada, o valor reduziu para 1,9 (IC95%: -0,5; 3,6, p = 0,141), sem significância estatística. O resultado do estudo mostrou que a cesariana não está associada ao QI dos adolescentes nessa amostra e reflete que as diferenças encontradas podem ser explicadas por outros fatores, como aspectos socioeconômicos e perinatais.

El objetivo del estudio fue evaluar la asociación entre la cesárea y el cociente de inteligencia (CI) en adolescentes del Municipio de São Luís, Maranhão, Brasil. Este es un estudio longitudinal que utiliza datos de la cohorte de nacimiento en São Luís, que comenzó en 1997. El abordaje ocurrió en la tercera fase de la cohorte, en 2016, con adolescente a los 18 y 19 años de edad. La variable de exposición fue la vía de nacimiento y la variable de resultado fue el CI, medido a partir de la aplicación de la tercera versión de la Escala de Inteligencia para Adultos (WAIS-III). En el análisis de datos se verificó el CI medio según las covariables y se utilizó la regresión lineal multivariada. Para controlar los factores de confusión se elaboró un modelo teórico utilizando el gráfico acíclico dirigido. Las variables de confusión fueron las socioeconómicas en el momento del nacimiento y las variables perinatales. El coeficiente intelectual promedio de los adolescentes fue de 101,4. En el análisis bruto, el CI de los adolescentes nacidos de cesárea fue 5,8 puntos mayor en relación a los nacidos de parto vaginal (IC95%: 3,8; 7,7, p ≤ 0,001), con significancia estadística. En el análisis multivariado, el valor se redujo a 1,9 (IC95%: -0,5; 3,6, p = 0,141), sin significación estadística. El resultado del estudio mostró que la cesárea no está asociada con el coeficiente intelectual de los adolescentes en esta muestra y refleja que las diferencias encontradas pueden explicarse por otros factores, como los aspectos socioeconómicos y perinatales.

Birth weight and bone mineral density at 18-19 years: birth cohort 1997-1998.

OBJECTIVE: To analyze the association between birth weight and bone mineral density (BMD) in adolescence. METHODS: A birth cohort study in São Luís, Maranhão, using data from two moments: at birth and at 18-19 years. Exposure was the birth weight in grams, continuously analyzed. The outcome was BMD, using the Z-score index (whole body) measured by double X-ray densitometry (Dexa). A theoretical model was constructed in acyclic graphs to identify the minimum set of adjustment variables - household income, the mother knowing how to read and write at the time of birth, prenatal care, tobacco use during pregnancy, and parity - to evaluate the association between birth weight and bone mineral density in adolescence. Multiple linear regression was used in Stata 14.0 software. A 5% significance level was adopted. RESULTS: From 2,112 adolescents, 8.2% had low birth weight and 2.8% had a low BMD for their age. The mean full-body Z-score was 0.19 (± 1.00). The highest birth weight was directly and linearly associated with BMD values in adolescence (Coef.: 0.10; 95%CI: 0.02-0.18), even after adjustment for the variables household income (Coef.: -0.33; 95%CI: -0.66-0.33) and the mother knowing how to read and write (Coef.: 0.23%; 95%CI: 0.03-0.43). CONCLUSION: Although after adjusting the variables the association attenuated, birth weight positively and linearly relates to BMD in adolescence.

Association between neonatal near miss and infant development: the Ribeirão Preto and São Luís birth cohorts (BRISA).

AIM: To analyze the association between neonatal near miss and infant development at two years. METHODS: Data from two birth cohorts, one conducted in Ribeirão Preto (RP)/São Paulo and the other in São Luís (SL)/Maranhão, were used. The cognitive, motor and communication development of children was evaluated using the Bayley Scales of Infant and Toddler Development, Third Edition (Bayley-III). The following criteria were used for the definition of NNM: birth weight < 1,500 g, 5-min Apgar score < 7, gestational age < 32 weeks, and report of congenital malformations. The relationship between neonatal near miss and development was assessed using the weighted propensity score from the Inverse Probability of Treatment Weighting (IPTW). A directed acyclic graph was built to select the adjustment variables. RESULTS: A total of 1,050 mother-newborn dyads were evaluated in SL and 1,840 in RP. Regarding outcomes in SL and RP, respectively, 2.4% and 17.3% of the children were not competent in the cognitive domain, 12.1% and 13.3% in the receptive communication domain, 39.2% and 47.1% in the expressive communication domain, 20.7% and 12.6% in the fine motor domain, and 14.3% and 13.8% in the gross motor domain. The prevalence of neonatal near miss was 5.4% in SL and 4.3% in RP. Unadjusted analysis showed an association of neonatal near miss with fine motor development in SL and RP and with the cognitive, receptive communication, expressive communication, and gross motor domains only in RP. These associations remained after adjusted analysis. CONCLUSION: Neonatal near miss is a risk factor for developmental delays.

Birth weight and bone mineral density at 18-19 years: birth cohort 1997-1998 / Peso ao nascer e densidade mineral óssea aos 18-19 anos: coorte de nascimentos 1997-1998

ABSTRACT OBJECTIVE To analyze the association between birth weight and bone mineral density (BMD) in adolescence. METHODS A birth cohort study in São Luís, Maranhão, using data from two moments: at birth and at 18-19 years. Exposure was the birth weight in grams, continuously analyzed. The outcome was BMD, using the Z-score index (whole body) measured by double X-ray densitometry (Dexa). A theoretical model was constructed in acyclic graphs to identify the minimum set of adjustment variables - household income, the mother knowing how to read and write at the time of birth, prenatal care, tobacco use during pregnancy, and parity — to evaluate the association between birth weight and bone mineral density in adolescence. Multiple linear regression was used in Stata 14.0 software. A 5% significance level was adopted. RESULTS From 2,112 adolescents, 8.2% had low birth weight and 2.8% had a low BMD for their age. The mean full-body Z-score was 0.19 (± 1.00). The highest birth weight was directly and linearly associated with BMD values in adolescence (Coef.: 0.10; 95%CI: 0.02-0.18), even after adjustment for the variables household income (Coef.: -0.33; 95%CI: -0.66-0.33) and the mother knowing how to read and write (Coef.: 0.23%; 95%CI: 0.03-0.43). CONCLUSION Although after adjusting the variables the association attenuated, birth weight positively and linearly relates to BMD in adolescence.

RESUMO OBJETIVO Analisar a associação entre o peso ao nascer e a densidade mineral óssea (DMO) na adolescência. MÉTODOS Estudo de coorte de nascimentos em São Luís, Maranhão, utilizando dados de dois momentos: ao nascimento e aos 18-19 anos. A exposição foi o peso ao nascer em gramas, analisado de forma contínua. O desfecho foi a DMO, utilizando o índice Z-escore (corpo inteiro) medido pela densitometria por dupla emissão de raios X (DEXA). Foi construído modelo teórico em gráficos acíclicos direcionados para identificar o conjunto mínimo de variáveis de ajuste - renda familiar, a mãe saber ler e escrever à época do nascimento, realização de pré-natal, tabagismo durante a gestação e paridade - para avaliar a associação entre o peso ao nascer e a densidade mineral óssea na adolescência. Utilizou-se regressão linear múltipla no software Stata 14.0. O nível de significância adotado foi de 5%. RESULTADOS Dos 2.112 adolescentes, 8,2% apresentaram baixo peso ao nascer e 2,8% apresentaram DMO considerada baixa para a idade. O Z-escore médio de corpo inteiro foi de 0,19 (± 1,00). O maior peso ao nascer foi associado de forma linear e direta aos valores de DMO na adolescência (Coef.: 0,10; IC95% 0,02-0,18), mesmo após ajuste para as variáveis renda familiar (Coef.: -0,33; IC95% -0,66-0,33) e a mãe saber ler e escrever (Coef.: 0,23; IC95% 0,03-0,43). CONCLUSÕES Apesar de a associação ter sido atenuada após ajuste das variáveis, o peso ao nascer está associado de forma positiva e linear à DMO na adolescência.

Nascer de cesariana e associação com quociente de inteligência em adolescentes: contribuição do Consórcio de Coortes RPS (Ribeirão Preto, Pelotas e São Luís), Brasil / Cesarean section and association with intelligence quotient in adolescents: contribution from the RPS Cohort Consortium (Ribeirão Preto, Pelotas and São Luís), Brazil / Parto por cesárea y asociación con cociente de inteligencia en adolescentes: contribución del Consorcio de Cohorte RPS (Ribeirão Preto, Pelotas y São Luís), Brasil

O objetivo do estudo foi avaliar a associação entre a cesariana e o quociente de inteligência (QI) em adolescentes do Município de São Luís, Maranhão, Brasil. Trata-se de um estudo longitudinal utilizando dados da coorte de nascimento em São Luís, iniciado no ano de 1997. A abordagem ocorreu na terceira fase da coorte, em 2016, com adolescente aos 18 e 19 anos de idade. A variável de exposição foi a via de nascimento e a variável de desfecho foi o QI, mensurada a partir da aplicação da terceira versão da Escala de Inteligência Wechsler para Adultos (WAIS-III). Na análise dos dados verificou-se a média do QI segundo as covariáveis e utilizou-se a regressão linear multivariada. Para controlar os fatores de confundimento foi elaborado um modelo teórico utilizando o gráfico acíclico dirigido. As variáveis confundidoras foram as socioeconômicas no momento do nascimento e as variáveis perinatais. A média do QI dos adolescentes foi 101,4. Na análise bruta, o QI dos adolescentes nascidos de cesariana foi 5,8 pontos maior em relação aos nascidos de parto vaginal (IC95%: 3,8; 7,7, p ≤ 0,001), com significância estatística. Na análise multivariada, o valor reduziu para 1,9 (IC95%: -0,5; 3,6, p = 0,141), sem significância estatística. O resultado do estudo mostrou que a cesariana não está associada ao QI dos adolescentes nessa amostra e reflete que as diferenças encontradas podem ser explicadas por outros fatores, como aspectos socioeconômicos e perinatais.

This study aimed to evaluate the association between cesarean section and intelligence quotient (IQ) in adolescents from the Municipality of São Luís, Maranhão State, Brazil. This is a longitudinal study using data from the São Luís birth cohort, started in 1997. The approach occurred in the third phase of the cohort, in 2016, with adolescents aged 18 and 19 years. The exposure variable was mode of delivery and the outcome variable was IQ, measured by applying the third version of the Wechsler Adult Intelligence Scale (WAIS-III). In the data analysis, the average IQ was verified according to the covariates and multivariate linear regression was used. To control confounding factors, a theoretical model was elaborated using the directed acyclic graph. The confounding variables were socioeconomic variables at birth and perinatal variables. Their average IQ was 101.4. In the crude analysis, the IQ of adolescents born by cesarean section was 5.8 points higher than those born by vaginal delivery (95%CI: 3.8; 7.7, p ≤ 0.001), with statistical significance. In the multivariate analysis, the value decreased to 1.9 (95%CI: -0.5; 3.6, p = 0.141), without statistical significance. The result of the study showed that cesarean section is not associated with the IQ of adolescents in this sample and reflects that the differences can be explained by other factors, such as socioeconomic and perinatal aspects.

El objetivo del estudio fue evaluar la asociación entre la cesárea y el cociente de inteligencia (CI) en adolescentes del Municipio de São Luís, Maranhão, Brasil. Este es un estudio longitudinal que utiliza datos de la cohorte de nacimiento en São Luís, que comenzó en 1997. El abordaje ocurrió en la tercera fase de la cohorte, en 2016, con adolescente a los 18 y 19 años de edad. La variable de exposición fue la vía de nacimiento y la variable de resultado fue el CI, medido a partir de la aplicación de la tercera versión de la Escala de Inteligencia para Adultos (WAIS-III). En el análisis de datos se verificó el CI medio según las covariables y se utilizó la regresión lineal multivariada. Para controlar los factores de confusión se elaboró un modelo teórico utilizando el gráfico acíclico dirigido. Las variables de confusión fueron las socioeconómicas en el momento del nacimiento y las variables perinatales. El coeficiente intelectual promedio de los adolescentes fue de 101,4. En el análisis bruto, el CI de los adolescentes nacidos de cesárea fue 5,8 puntos mayor en relación a los nacidos de parto vaginal (IC95%: 3,8; 7,7, p ≤ 0,001), con significancia estadística. En el análisis multivariado, el valor se redujo a 1,9 (IC95%: -0,5; 3,6, p = 0,141), sin significación estadística. El resultado del estudio mostró que la cesárea no está asociada con el coeficiente intelectual de los adolescentes en esta muestra y refleja que las diferencias encontradas pueden explicarse por otros factores, como los aspectos socioeconómicos y perinatales.

Insulin resistance phenotype is associated with vascular risk phenotype at the end of the second decade of life: a population-based study.

We hypothesize that early events of diabetes and cardiovascular disease continuums would be ongoing and associated in adolescents. We investigated the association between the Insulin Resistance Phenotype and the Vascular Risk Phenotype at the end of the second decade of life and indirect pathways from social vulnerability, alcohol consumption, and body fat mass. It is a population-based study in the RPS cohort of 18-19 years (n = 2,515), São Luís, Brazil. The theoretical model analyzed the association between Insulin Resistance Phenotype and Vascular Risk Phenotype by sex, using structural equation modeling (SEM). The Insulin Resistance Phenotype was a latent variable deduced from the correlations of Triglyceride to HDL ratio, Triglyceride Glycemic index, and VLDL; the Vascular Risk Phenotype was deduced from Systolic Blood Pressure, Diastolic Blood Pressure, and Pulse Wave Velocity. The Insulin Resistance Phenotype was directly associated with the Vascular Risk Phenotype in males (standardized coefficient SC = 0.183; p < 0.001) and females (SC = 0.152; p < 0.001). The Insulin Resistance Phenotype was an indirect pathway in the association of alcohol consumption and higher values of fat mass index with the Vascular Risk Phenotype. VLDL presented the highest factor loading, appearing as a marker of insulin resistance linked to cardiovascular risk in young people. Lower values of socioeconomic status, harmful use of alcohol, and high body fat values were also associated with higher values of the two phenotypes. The association of the Insulin Resistance Phenotype with the Vascular Risk Phenotype suggests common pathophysiological mechanisms present in early events in the continuums of diabetes and cardiovascular disease in adolescence.

Association between prepregnancy and newborn body mass index / Associação entre o índice de massa corporal pré-gestacional e o do recém-nascido

Abstract Objectives: to investigate the association between prepregnancy body mass index (BMI) and newborns' (NB) BMI. Methods: cohort study with 1,365 pregnant women and their newborns from the BRISA survey (Brazilian Ribeirão Preto and São Luís Birth Cohort Studies) in São Luís-MA. Prepregnancy BMI was self-reported, and newborns' BMI was estimated using the weight and length measured at birth. A directed acyclic graph (DAG) was developed to identify the adjustment variables. The association between the prepregnancy BMI and newborns' BMI were analyzed using multiple linear and Poisson regression with robust variance estimation. Results: NBs had 13.4±1.7kg/m2 average BMI at birth. In the linear analysis, we observed that as the prepregnancy BMI increases, the NBs BMI also increases (ß=0.07; CI95%=0.05-0.09;p<0.001). Newborns of mothers with prepregnancy overweight were 3.58 times more likely to be overweight. Conclusion: prepregnancy BMI can affect newborn's BMI early. Thus, women planning to become pregnant should consider conducting nutritional planning to maintain or obtain a healthy weight to minimize the risk of overweight for the newborn.

Resumo Objetivos: investigar a associação entre o Índice de Massa Corporal (IMC) pré-gestacional e o IMC do recém-nascido (RN). Métodos: estudo de coorte, com 1365 gestantes e seus RN, participantes da pesquisa BRISA (Brazilian Ribeirão Preto and São Luís Birth Cohort Studies) em São Luís-MA. O IMC pré-gestacional foi autorreferido e o IMC do RN foi calculado por meio do peso e comprimento aferidos na ocasião do nascimento. Foi elaborado um Gráfico Acíclico Direcionado (DAG)para identificaras variáveis de ajuste. A associação entre o IMC pré-gestacional e IMC do RN foram analisados por regressão linear múltipla e regressão de Poisson com estimativa robusta da variância. Resultados: os RN tiveram IMC ao nascer médio de 13,4 ± 1,7 kg/m2. Na análise linear, foi observada que à medida que o IMC pré-gestacional aumenta, o IMC do RN também aumenta (ß= 0,07; IC95%= 0,05 - 0,09; p<0.001). RN de mães com excesso de peso pré-gestacional tiveram risco 3,58 vezes maior de terem excesso de peso. Conclusão: o IMC pré-gestacional pode afetar precocemente o IMC do RN. Dessa forma, recomenda-se que mulheres que planejem engravidar considerem realizar um planejamento nutricional para a manutenção ou obtenção de um peso saudável, a fim de minimizar o risco de excesso de peso para o RN.

Association between violence and depression during pregnancy with perinatal outcomes: a moderated mediation analysis.

OBJECTIVE: To assess the direct, indirect, and total effects of violence during pregnancy on perinatal outcomes, and to evaluate the effect of violence as a moderator of the mediated relationship of depression with perinatal outcomes. METHODS: Data was collected from the prenatal study and follow-ups of the BRISA cohort, São Luís, Maranhão, Brazil. The perinatal outcomes investigated were: birth weight (BW), intrauterine growth restriction (IUGR) and gestational age (GA). Violence against women was evaluated using the World Health Organization Violence against Women instrument (Violence during pregnancy - regardless of the type of violence; Physical violence during pregnancy; Psychological violence during pregnancy). Depressive symptoms during pregnancy were evaluated as a mediating variable. Moderated mediation analysis was performed to estimate the effects of violence and depression on perinatal outcomes. RESULTS: Three types of violence analyzed by depression had an indirect effect in BW and GA. None of the types of violence showed an association with IUGR. All types of violence analyzed showed a moderated mediation effect with BW and GA. Only among women who experienced violence were birth weight and gestational age lower the higher the values of depressive symptoms. CONCLUSION: Violence and depression are only associated with lower BW and GA when they occur simultaneously.

Characteristics associated with drug resistant epilepsy in children up to 36 months old with Congenital Zika Syndrome.

OBJECTIVES: To verify characteristics associated with drug resistant epilepsy in children up to 36 months of age with Congenital Zika Syndrome (CZS). METHODS: This is a prospective cohort study with children aged up to 36 months diagnosed with CZS. Obstetric, demographic, phenotype and other clinical signs, cranial tomography, growth and motor development of the children were collected. RESULTS: Of a total of 109 children diagnosed with CZS, 100 (91.7%) had epilepsy and 68 (68%) with drug resistant seizures. The types of seizures associated with drug resistant epilepsy were focal seizures from the occipital lobe, generalized tonic and generalized tonic-clonic seizures. There was an association between drug resistant epilepsy and microcephaly at birth, severe microcephaly at birth, excess nuchal skin, ventriculomegaly, reduced brain parenchyma volume, and hypoplasia or malformation of the cerebellum. Difficulty sleeping, irritability, continuous crying, dysphagia and gross motor function were clinical signs associated with drug resistant epilepsy, as were the presence of ocular abnormalities, low head circumference in the first year of life and low weight in the first six months. CONCLUSIONS: The prevalence of drug resistant epilepsy in children up to 36 months with CZS was 62.4% and was associated with the severity of the child's neurological damage, with emphasis on the reduction of brain parenchyma volume and damage to the cerebellum.

Decline in head circumference growth and associated factors in congenital Zika syndrome.

Little is known about the evolution of head circumference (HC) in children with congenital Zika syndrome (CZS). This study aims to evaluate HC growth in children with CZS in the first three years of life and identify associated factors. HC data obtained at birth and in neuropediatric consultations from 74 children with CZS were collected from the Child's Health Handbook, parents' reports, and medical records. Predictors of HC z-score were investigated using different mixed-effects models; Akaike's information criterion was used for model selection. The HC z-score decreased from -2.7 ± 1.6 at birth to -5.5 ± 2.2 at 3 months of age, remaining relatively stable thereafter. In the selected adjusted model, the presence of severe brain parenchymal atrophy and maternal symptoms of infection in the first trimester of pregnancy were associated with a more pronounced reduction in the HC z-score in the first three years of life. The decrease of HC z-score in CZS children over the first three months demonstrated a reduced potential for growth and development of the central nervous system of these children. The prognosis of head growth in the first 3 years of life is worse when maternal infection occurs in the first gestational trimester and in children who have severe brain parenchymal atrophy.

Are Fat Mass and Lean Mass Associated with Grip Strength in Adolescents?

Background: The interaction between lean body mass (LBM) and fat mass index (FMI) with grip strength (GS) has not been explored in the same analysis model in adolescents. This study thus aims to analyze the association between FMI and LBM with GS. Methods: This cross-sectional study was conducted with data from the 2016 follow-up of the 1997/98 Birth Cohort of São Luís. Grip strength was assessed by the Jamar Plus + dynamometer. The LBM and FMI indexes were assessed [ratio of the mass (lean or fat-kg) to height (m2)]. The confounding variables identified for the relationship between FMI and LBM with GS in the same analysis model, by directed acyclic graph (DAG), were sex, age, race, work, alcohol consumption, smoking, physical activity, and consumption of ultra-processed foods and culinary preparations, used in the adjusted analysis. Results: A total of 2339 adolescents (52.5% girls) were analyzed. The boys have a higher GS than the girls. In the adjusted analysis, with each increase of 1 kg/m2 in the FMI, GS was reduced by 0.72 kgf for boys and 0.35 kgf for girls. At each increase of 1 kg/m2 in the LBM, GS increased by 2.18 kgf for boys and 1.26 kgf for girls. Conclusions: FMI was associated with lower GS regardless of the LBM. LBM was associated with higher GS regardless of the FMI.

Factors associated with neonatal-near miss: birth cohorts in three Brazilian cities - Ribeirão Preto, Pelotas and São Luís, Brazil.

The aim of this study was to investigate the association of sociodemographic factors, lifestyle, maternal reproductive profile and prenatal and childbirth care with neonatal near miss (NNM) morbidity in four birth cohorts. This study involved four population-based birth cohorts: Ribeirão Preto (RP) and São Luís (SL) (2010), Pelotas 2004 (PEL04) and 2015 (PEL15). NNM was defined when one or more of the following conditions were present: birthweight <1,500 g, 5-minute Apgar score <7, gestational age <32 weeks, and report of congenital malformations. The covariates were obtained with questionnaires applied to the puerperal women. Some particularities between cohorts were identified. In the RP and SL cohorts, factors of the more distal levels (sociodemographic, lifestyle, and reproductive profile) were associated with NNM. On the other hand, proximal factors related to healthcare were more significant for the occurrence of NNM in PEL. Only the absence of prenatal care was associated with NNM in all cohorts: RP (OR=4.27, 95%CI 2.16-8.45), SL (OR=2.32, 95%CI 1.09-4.94), PEL04 (OR=4.79, 95%CI 1.59-14.46), and PEL15 (OR=5.10, 95%CI 2.60-9.97).

Factors associated with perinatal mortality in a Brazilian Northeastern capital. / Fatores associados à mortalidade perinatal em uma capital do Nordeste brasileiro.

This study investigated factors associated with perinatal mortality in São Luís, Maranhão, Northeastern Brazil. Data on perinatal mortality were obtained from the BRISA birth cohort and from the Mortality Information System, including records of 5,236 births, 70 of which referred to fetal deaths and 36 to early neonatal deaths. Factors associated with mortality were investigated using a hierarchical logistic regression model, resulting in a perinatal mortality coefficient equal to 20.2 per thousand births. Mothers with low education level and without a partner were associated with an increased risk of perinatal death. Moreover, children of mothers who did not have at least six antenatal appointments and with multiple pregnancies (OR= 9.15; 95%CI:4.08-20.53) were more likely to have perinatal death. Perinatal death was also associated with the presence of congenital malformations (OR= 4.13; 95%CI:1.23-13.82), preterm birth (OR= 3.36; 95%CI:1.56-7.22), and low birth weight (OR=11.87; 95%CI:5.46-25.82). In turn, families headed by other family members (OR= 0.29; 95%CI: 0.12 - 0.67) comprised a protective factor for such condition. Thus, the results indicate an association between perinatal mortality and social vulnerability, non-compliance with the recommended number of prenatal appointments, congenital malformations, preterm birth, and low birthweight.

O objetivo do estudo foi avaliar os fatores sociodemográficos, maternos e do recém-nascido associados à mortalidade perinatal em São Luís, Maranhão. Os óbitos perinatais foram identificados na coorte e pelo Sistema de Informações sobre Mortalidade. Foram incluídos 5.236 nascimentos, sendo 70 óbitos fetais e 36 neonatais precoces. Para investigar os fatores associados utilizou-se análise de regressão logística com modelo hierarquizado. O coeficiente de mortalidade perinatal foi 20,2 por mil nascimentos. A baixa escolaridade materna e a ausência de companheiro foram associadas a maior chance de óbito perinatal. A família ser chefiada por outros familiares foi fator de proteção. Tiveram maior chance de óbito perinatal filhos de mães que não realizaram pelo menos seis consultas de pré-natal (OR=4,61; IC95%:2,43-8,74) e com gravidez múltipla (OR=9,15; IC95%:4,08-20,53). Presença de malformações congênitas (OR=4,13; IC95%:1,23-13,82), nascimento pré-termo (OR= 3,36; IC95%: 1,56-7,22) e baixo peso ao nascer (BPN) (OR=11,87; IC95%:5,46-25,82) se associaram ao óbito perinatal. A mortalidade perinatal foi associada à vulnerabilidade social, não realização do número de consultas pré-natal recomendado, malformações congênitas, nascimento pré-termo e BPN.

Cesarean section and body mass index in children: is there a causal effect?

Obesity is considered a global public health problem. Cesarean section has been associated with high body mass index (BMI) and increased obesity throughout life. However, this association has been challenged by some studies. This study aims to assess the causal effect of cesarean section on the BMI of children aged 1-3 years. This is a cohort study of 2,181 children aged 1-3 years, born in 2010, obtained from the BRISA Birth Cohort, in São Luís, state of Maranhão, Brazil. Sociodemographic variables, maternal characteristics, type of childbirth, morbidity, anthropometric measurements, and BMI were assessed. Marginal structural models with a counterfactual approach were used to check the causal effect of the type of childbirth on obesity, weighted by the inverse probability of selection and exposure. Out of the 2,181 children assessed (52% female), 50.6% were born by cesarean section, 5.9% of the newborn infants were large for gestational age, and 10.7% of them had excess weight. No causal effect of cesarean section on BMI was observed (coefficient = -0.004; 95%CI: -0.136; 0.127; p = 0.948). Cesarean section did not have a causal effect on the BMI of children aged 1-3 years.

Fatores associados à mortalidade perinatal em uma capital do Nordeste brasileiro / Factors associated with perinatal mortality in a Brazilian Northeastern capital

Resumo O objetivo do estudo foi avaliar os fatores sociodemográficos, maternos e do recém-nascido associados à mortalidade perinatal em São Luís, Maranhão. Os óbitos perinatais foram identificados na coorte e pelo Sistema de Informações sobre Mortalidade. Foram incluídos 5.236 nascimentos, sendo 70 óbitos fetais e 36 neonatais precoces. Para investigar os fatores associados utilizou-se análise de regressão logística com modelo hierarquizado. O coeficiente de mortalidade perinatal foi 20,2 por mil nascimentos. A baixa escolaridade materna e a ausência de companheiro foram associadas a maior chance de óbito perinatal. A família ser chefiada por outros familiares foi fator de proteção. Tiveram maior chance de óbito perinatal filhos de mães que não realizaram pelo menos seis consultas de pré-natal (OR=4,61; IC95%:2,43-8,74) e com gravidez múltipla (OR=9,15; IC95%:4,08-20,53). Presença de malformações congênitas (OR=4,13; IC95%:1,23-13,82), nascimento pré-termo (OR= 3,36; IC95%: 1,56-7,22) e baixo peso ao nascer (BPN) (OR=11,87; IC95%:5,46-25,82) se associaram ao óbito perinatal. A mortalidade perinatal foi associada à vulnerabilidade social, não realização do número de consultas pré-natal recomendado, malformações congênitas, nascimento pré-termo e BPN.

Abstract This study investigated factors associated with perinatal mortality in São Luís, Maranhão, Northeastern Brazil. Data on perinatal mortality were obtained from the BRISA birth cohort and from the Mortality Information System, including records of 5,236 births, 70 of which referred to fetal deaths and 36 to early neonatal deaths. Factors associated with mortality were investigated using a hierarchical logistic regression model, resulting in a perinatal mortality coefficient equal to 20.2 per thousand births. Mothers with low education level and without a partner were associated with an increased risk of perinatal death. Moreover, children of mothers who did not have at least six antenatal appointments and with multiple pregnancies (OR= 9.15; 95%CI:4.08-20.53) were more likely to have perinatal death. Perinatal death was also associated with the presence of congenital malformations (OR= 4.13; 95%CI:1.23-13.82), preterm birth (OR= 3.36; 95%CI:1.56-7.22), and low birth weight (OR=11.87; 95%CI:5.46-25.82). In turn, families headed by other family members (OR= 0.29; 95%CI: 0.12 - 0.67) comprised a protective factor for such condition. Thus, the results indicate an association between perinatal mortality and social vulnerability, non-compliance with the recommended number of prenatal appointments, congenital malformations, preterm birth, and low birthweight.

Is sleep time associated with handgrip strength in adolescents from the 1997/1998 São Luís Birth Cohort?

This article aims to analyze the association between sleep time and handgrip strength in adolescents belonging to the 1997/1998 São Luís Birth Cohort. This was a cross-sectional study nested in a birth cohort study. One thousand two hundred sixty-nine individuals (18 and 19 years) wore an Actigraph® GTX3+ accelerometer on their wrist 24 hr/day for 7 consecutive days. Handgrip strength was measured using a digital hand dynamometer. We used directed acyclic graphs (DAG) to identify confounding variables. This sample of adolescents was mostly composed of men, with brown skin color, economic class C, which did not work, did not consume alcohol, did not smoke, and never used drugs. The mean value of handgrip strength was 28.2 (±9.3) kgf, and the mean of sleep time was 6 (±1.0) hours per day. The crude analysis showed an association between sleep time and muscle strength. An increase of one hour of sleep reduced the handgrip strength by 1.95 kgf (95%CI:-2.51;-1.39). However, after adjustment for confounders, the association was not maintained (ß:-0.07; 95%CI:-0.48;0.36). Sleep time is not associated with handgrip strength in adolescents in São Luís.