Determinants of dysmenorrhoea among female adolescents: results from a community-based cohort study in Amsterdam.

RESEARCH QUESTION: What is the contribution of sociodemographic, psychosocial, lifestyle and reproductive factors up to the age of 11-12 years to the occurrence of dysmenorrhoea at age 15-16 years within the Amsterdam Born Children and their Development (ABCD) study? DESIGN: Data of 1038 female adolescents were used. Participants' baseline characteristics were obtained using self-reported questionnaires up to the age of 11-12 years, as well as the obstetric information of their mothers during pregnancy. Dysmenorrhoea was assessed at the age of 15-16 years, and was deemed to be present if an adolescent reported menstrual abdominal and/or back pain and therefore took medication and/or hormonal contraception. Using a backward selection approach, potential determinants of dysmenorrhoea were selected and multivariable associations were determined. RESULTS: The overall prevalence of dysmenorrhoea was 49.5% among the participants. Intake of 3-4.5 sugar-sweetened beverages/day (P = 0.035) and higher gynaecological age (i.e. years since menarche) (P < 0.001) were significantly associated with higher occurrence of dysmenorrhoea in the final model, which explained 8.1% of the total variance in the occurrence of dysmenorrhoea. No significant associations were found between the occurrence of dysmenorrhoea and sociodemographic or psychosocial factors. CONCLUSIONS: This investigation of various potential risk factors for dysmenorrhoea suggests that diet and reproductive factors are particularly important predictors of the occurrence of dysmenorrhoea among young adolescents. Specifically, intake of sugar-sweetened beverages and higher gynaecological age were predictive of the occurrence of dysmenorrhoea. Other lifestyle factors were also identified as possible risk factors. Using this knowledge, effective strategies can be developed to reduce the burden of dysmenorrhoea among adolescents, and to provide appropriate care for those suffering from the condition.

Associations of Maternal Educational Level, Proximity to Greenspace During Pregnancy, and Gestational Diabetes With Body Mass Index From Infancy to Early Adulthood: A Proof-of-Concept Federated Analysis in 18 Birth Cohorts.

International sharing of cohort data for research is important and challenging. We explored the feasibility of multi-cohort federated analyses by examining associations between three pregnancy exposures (maternal education, exposure to green vegetation and gestational diabetes) with offspring BMI from infancy to 17 years. We used data from 18 cohorts (n=206,180 mother-child pairs) from the EU Child Cohort Network and derived BMI at ages 0-1, 2-3, 4-7, 8-13 and 14-17 years. Associations were estimated using linear regression via one-stage IPD meta-analysis using DataSHIELD. Associations between lower maternal education and higher child BMI emerged from age 4 and increased with age (difference in BMI z-score comparing low with high education age 2-3 years = 0.03 [95% CI 0.00, 0.05], 4-7 years = 0.16 [95% CI 0.14, 0.17], 8-13 years = 0.24 [95% CI 0.22, 0.26]). Gestational diabetes was positively associated with BMI from 8 years (BMI z-score difference = 0.18 [CI 0.12, 0.25]) but not at younger ages; however associations attenuated towards the null when restricted to cohorts which measured GDM via universal screening. Exposure to green vegetation was weakly associated with higher BMI up to age one but not at older ages. Opportunities of cross-cohort federated analyses are discussed.

Vitamin B12 and folate status in early pregnancy and cardiometabolic risk factors in the offspring at age 5-6 years: findings from the ABCD multi-ethnic birth cohort.

OBJECTIVE: To explore whether maternal vitamin B12 and folate status during early pregnancy are associated with cardiometabolic risk factors in the offspring at age 5-6. DESIGN: Prospective multi-ethnic birth cohort, the Amsterdam Born Children and their Development study (ABCD). SETTING: 12,373 pregnant women living in Amsterdam were approached between 2003 and 2004 for participation in the study. POPULATION: Mother-child pairs for whom information on maternal vitamin B12 or folate status in early gestation and health at age 5-6 years was available (n = 1950). METHODS: Vitamin B12 and folate concentrations were determined in maternal serum at intake in early pregnancy (median 13 weeks' gestation). Anthropometric measurements, blood pressure and fasting blood samples were collected during a health check of children aged 5-6 years. Multiple linear regression was performed to investigate the association between maternal serum concentrations and children's outcomes, corrected for confounders. MAIN OUTCOME MEASURES: Gestational age at birth, birthweight, body mass index (BMI), glucose levels, triglyceride levels, blood pressure and heart rate of the offspring at age 5-6. RESULTS: Low maternal folate levels during early pregnancy were associated with slightly higher BMI in the offspring [decrease per 10 units: ß 0.07 kg/m(2), 95% confidence interval (CI) 0.01, 0.13]. Low maternal vitamin B12 concentrations were associated with higher heart rates (decrease per 100 units: ß 0.49 beats/min, 95% CI 0.11, 0.87). CONCLUSION: This study provides further evidence that maternal nutrition in early pregnancy may possibly program cardiometabolic health of the offspring. TWEETABLE ABSTRACT: Low folate and vitamin B12 levels during pregnancy are associated with higher BMI and heart rate in offspring.

The association of birth weight and infant growth with physical fitness at 8-9 years of age--the ABCD study.

BACKGROUND: Low birth weight and accelerated infant growth are independently associated with childhood obesity. We hypothesized that birth weight and infant growth are associated with physical fitness in childhood, and thereby could act as a link in the developmental origins of obesity. In addition, we assessed whether these associations were mediated by fat-free mass (FFM), moderate-to-vigorous physical activity (MVPA) or sedentary behavior (SB). METHODS: We assessed physical fitness in 194 children of Dutch ethnicity aged 8.6 (±0.35) years from the ABCD cohort. Aerobic fitness was assessed using the 20-meter multistage shuttle run test (20-m MSRT), and neuromuscular fitness using the standing broad jump (SBJ) test and hand grip strength test. MVPA and SB were measured by accelerometry, and FFM by bioelectrical impedance analysis. Low birth weight was defined as below the 10th percentile and accelerated infant growth as an s.d. score weight gain of >0.67 between birth and 12 months. RESULTS: Children with low birth weight and subsequent accelerated infant growth attained a lower 20-m MSRT score than the remainder of the cohort, adjusted for multiple confounders (P<0.01). Birth weight and infant growth were both independently positively associated with hand grip strength, but not after adjusting for current height and body mass index. There was no association of birth weight or infant growth with SBJ. FFM mediated >75% of the association of birth weight and infant growth with hand grip strength, but FFM, MVPA and SB did not mediate the associations with 20-m MSRT. CONCLUSIONS: Our results indicate that low birth weight and accelerated infant growth might negatively affect childhood aerobic and neuromuscular fitness. Differences in FFM largely explain the developmental origins of neuromuscular fitness. Consequently impaired fitness may constitute a link between low birth weight, accelerated infant growth and obesity. Hence, optimization of fitness in these children may affect their obesity and cardiovascular disease risk.

Associations of infant feeding and timing of linear growth and relative weight gain during early life with childhood body composition.

BACKGROUND: Growth and feeding during infancy have been associated with later life body mass index. However, the associations of infant feeding, linear growth and weight gain relative to linear growth with separate components of body composition remain unclear. METHODS: Of 5551 children with collected growth and infant-feeding data in a prospective cohort study (Amsterdam Born Children and their Development), body composition measured using bioelectrical impedance analysis at the age of 5-6 years was available for 2227 children. We assessed how feeding (duration of full breastfeeding and timing of introduction of complementary feeding) and conditional variables representing linear growth and relative weight gain were associated with childhood fat-free mass (FFM) and fat mass (FM). RESULTS: Birth weight was positively associated with both FFM and FM in childhood, and more strongly with FFM than FM. Faster linear growth and faster relative weight gain at all ages in infancy were positively associated with childhood FFM and FM. The associations with FM were stronger for relative weight gain than for linear growth (FM z score: ß coefficient 0.23 (95% con 0.19 to 0.26), P<0.001 and 0.14 (0.11 to 0.17), P<0.001 per s.d. change in relative weight gain and linear growth between 1 and 3 months, respectively). Compared with full breastfeeding <1 month, full breastfeeding >6 months was associated with lower FM (FM z score: -0.17 (-0.28 to -0.05), P=0.005) and lower FFM (FFM z score: -0.13 (-0.23 to -0.03), P=0.015), as was the introduction of complementary feeding >6 months (FM z score: -0.22 (-0.38 to -0.07), P=0.004), compared with <4 months. CONCLUSIONS: Faster infant weight gain is associated with a healthier childhood body composition when it is caused by faster linear growth. Full breastfeeding >6 months and introduction of complementary feeding >6 months are associated with lower childhood FM.

Deviant early pregnancy maternal triglyceride levels and increased risk of congenital anomalies: a prospective community-based cohort study.

OBJECTIVE: The maternal lipid profile could be of importance in congenital anomaly development. This study therefore investigates whether the maternal lipid profile during early pregnancy is associated with major nonsyndromic congenital anomalies (MNCA). DESIGN: Prospective community-based cohort study. SETTING: Amsterdam Born Children and their Development (ABCD) study. POPULATION: A cohort of 3074 pregnant women recruited in 2003-2004 and their offspring. METHODS: Non-fasting blood samples from pregnant women participating in the ABCD-study (median 12.9 weeks of gestation) were analysed for triglycerides (TG), cholesterol (TC), free fatty acids (FFA), apolipoprotein B (ApoB), and apolipoprotein A1 (ApoA) (n = 3074). The perinatal outcome (MNCA) was obtained from the Youth Health Care Registration and two questionnaires. Adjustment was made for ethnicity. MAIN OUTCOME MEASURE: MNCA prevalence. RESULTS: The prevalence of MNCA was 2.2% (n = 68: 20 cardiovascular, 25 bone and muscle, and 23 other single anomalies). A nonlinear association was found between maternal TG levels and MNCA prevalence. With a lower or higher level of maternal TG, the estimated probability increased: a TG level of 0.73 mmol/l (5th percentile), of 1.28 mmol/l (50th percentile), and of 2.35 mmol/l (95th percentile) corresponded with an estimated probability of 3.6, 2.1, and 2.9%, respectively. Unadjusted subgroup analyses showed that the U-shaped association was most prominent for cardiovascular congenital anomalies. Other lipids were not associated with MNCA. CONCLUSIONS: Both low and high maternal TG levels during early pregnancy were associated with an increased risk of MNCA in offspring. This suggests that an attempt should be made to normalise TG levels before or during early pregnancy; however, replication of our results is necessary before clinical practice recommendations can be made.

Weight loss in pregnancy and cardiometabolic profile in childhood: findings from a longitudinal birth cohort.

OBJECTIVE: To investigate the consequences of weight loss in pregnancy on pregnancy outcomes and cardiometabolic profile in childhood. DESIGN: Prospective birth cohort (ABCD study). SETTING: Between 2003 and 2004, all pregnant women in Amsterdam were approached for study participation. POPULATION: 7818 pregnant women were included, of which 3165 consented to having their children examined at 5-6 years of age. In 1956 children fasting capillary blood samples were also taken. METHODS: At antenatal booking, women answered questions about their pregnancy and whether they suffered from severe weight loss (SWL; >5 kg). Pregnancy details and outcomes were available through the obstetric caregiver. MAIN OUTCOME MEASURES: At birth main outcome measures were prematurity (<37 weeks) and birthweight. At follow-up, body mass index (BMI), blood pressure, glucose and lipids were assessed. RESULTS: SWL occurred in 6.8% of cases. Women with SWL had similar preterm birth rates compared with women without these complaints (adjusted OR 1.1, 95%CI 0.7, 1.7). Birthweight (adjusted difference - 31 g, 95%CI -76, 15) and BMI at 5-6 years of age (adjusted difference 0.2 kg/m(2) , 95%CI 0.0, 0.5) were similar in children born to mothers with SWL and without SWL, but blood pressure was increased. For diastolic blood pressure this association was independent of confounders (adjusted difference 1.4 mmHg, 95%CI 0.4, 2.4). Lipid and glucose levels were not significantly different between these groups. CONCLUSION: Early pregnancy weight loss, usually occurring as a manifestation of hyperemesis gravidarum, could have long-term consequences for offspring health.

Ethnic differences in maternal underestimation of offspring's weight: the ABCD study.

OBJECTIVE: To determine the ethnic variation in maternal underestimation of their child's weight status and the explanatory role of socio-economic status (SES), acculturation and parental body mass index (BMI). METHOD: A multi-ethnic sample of 2769 normal or overweight/obese children (underweight children excluded) aged 5-7 years was examined (The Amsterdam Born Child and their Development study), comprising five ethnic subgroups: Dutch (n=1744), African descent (n=184), Turkish (n=86), Moroccan (n=161) and other non-Dutch (n=592). Data on mothers' perception of their child's weight status (5-point scale from 'too low' to 'too high'), SES, acculturation, parental BMI and the children's height and weight were collected. Underestimation was defined by comparing maternal perception with the actual weight status of her child (International Obesity Task Force guidelines). Ethnic differences in underestimation were calculated in the normal weight and overweight/obese categories. RESULTS: Underestimation ranged from 3.6 (Dutch) to 15.7% (Moroccan) in normal-weight children, and from 73.0 (Dutch) to 92.3% (Turkish) in overweight/obese children. After correction for ethnic differences in child's BMI, higher odds ratios (ORs) for underestimation were found in the Turkish (normal weight: OR 6.83; 95% confidence interval (CI) 2.33-20.05 and overweight: OR 2.80; 95% CI 1.12-6.98) and Moroccan (normal weight: OR 11.55; 95% CI 5.28-25.26) groups (reference is the Dutch group). Maternal educational level and immigrant generation largely explained the ethnic differences, with a minor contribution of maternal age. After correction, ORs remained higher in the Moroccan group (OR 4.37; 95% CI 1.79-10.62) among the normal-weight children. CONCLUSION: Mothers frequently underestimate the actual weight status of their child, especially mothers from Turkish or Moroccan origin. Having a lower SES, being first-generation immigrant and a young mother are important determinants in explaining these differences. As weight perceptions may affect weight gain and almost all mothers of overweight/obese children underestimate their child's weight, health professionals should help mothers (particularly those from ethnic minority groups) to acquire a realistic perception of their children's weight status.

Contribution of overweight and obesity to the occurrence of adverse pregnancy outcomes in a multi-ethnic cohort: population attributive fractions for Amsterdam.

OBJECTIVE: To estimate the contribution of pre-pregnancy excessive weight to the occurrence of adverse pregnancy outcomes and to detect the differences in these contributions between different ethnic groups. DESIGN: Prospective multi-ethnic community-based cohort study. SETTING: The prevalence of excessive weight is increasing and in general higher in immigrant groups in many industrialised countries. Maternal excessive weight, like smoking during pregnancy, is an important risk factor for adverse pregnancy outcomes. POPULATION: A total of 8266 pregnant women, living in the Netherlands, were included in the ABCD study between January 2003 and March 2004. METHODS: After applying the exclusion criteria, the analysis included 7871 pregnancies. Binomial log-linear regression analyses were performed to estimate relative risks (RRs) expressing the association between overweight/obesity and small-for-gestational-age (SGA), large-for-gestational-age (LGA), preterm birth (PTB; <37 weeks of gestation) and extreme PTB (<32 weeks of gestation), controlling for parity, maternal age, education level and smoking. Next, the RRs were used to estimate population attributive fractions (PAF) for Amsterdam and separately for several ethnic groups. MAIN OUTCOME MEASURES: The RRs and PAFs. RESULTS: The PAFs for overweight/obesity were: SGA -4.9%, LGA 15.3%, PTB 6.6% and extreme PTB 22.0%. In absolute terms, this corresponds to -47 SGA infants, 126 LGA infants, 35 PTB and 20 extreme PTB per year in Amsterdam. Except for SGA, these PAFs were higher than those for smoking (6.2%, -3.9%, 5.5% and 10.6%, respectively). The contribution of overweight/obesity to LGA and PTB was higher in non-Western immigrant groups. CONCLUSIONS: Overweight/obesity has become an important contributor to the occurrence of adverse pregnancy outcomes in Amsterdam. For most outcomes, these contributions are larger than those for smoking. Development of special obesity prevention programmes for young women is required, especially focused on immigrant groups.

High levels of antenatal maternal anxiety are associated with altered cognitive control in five-year-old children.

This longitudinal prospective study examined the relation between maternal anxiety during pregnancy and specific aspects of children's cognitive functioning at age five. Antenatal maternal state-anxiety was measured around the 16th week of pregnancy. Children's neurocognitive functioning was examined using a simple reaction time (RT) task, and a choice RT task. Multiple regression analyses in the total sample (N = 922) showed that antenatal anxiety was positively related to children's intra-individual variability in RT in the simple task. In a subsample (n = 100) of women with state-anxiety scores above the 90th percentile, antenatal anxiety was positively associated with mean RT and intra-individual variability in RT in the incompatible trials of the choice RT task. In addition, in this subsample of highly anxious mothers we found a significant positive association in boys but not in girls, between prenatal maternal anxiety and intra-individual variability in RT in the simple task.

Longitudinal Associations Between Trauma Exposure and Executive Functions in Children: Findings from a Dutch Birth Cohort Study.

This study is the first to distinguish two possible predictive directions between trauma exposure and executive functioning in children in a community sample. The sample consists of 1006 children from two time points with a seven years' time interval of a longitudinal Dutch birth cohort study, the ABCD-study (Van Eijsden et al., 2011). We analyzed the longitudinal associations between trauma exposure and executive functioning using structural equation modeling. The results demonstrated that (after controlling for prenatal substance exposure and mothers' educational level) trauma exposure before age 5 is predictive of poorer executive functioning at age 12 and trauma exposure between age 6 and 12. However, the association between executive functioning at age 5 and trauma exposure between age 6 and 12 was not statistically significant. Our results indicate that early life trauma exposure has a long term impact on later executive functioning and not the other way around. On top of that, trauma exposure seems to accumulate across childhood when children are exposed to a traumatic event before the age of 5. When looking at the potential moderating role of parenting behavior we found no evidence for such a moderating effect of parenting behavior. Our findings showed that children exposed to trauma early in life may experience problems in executive functioning later in life and they seem at higher risk for cumulative trauma exposure. Clinical practice should take this into account in both the way they provide (early) mental health care and in prevention and recognition of early trauma exposure.

Comparison of growth between native and immigrant infants between 0-3 years from the Dutch ABCD cohort.

BACKGROUND: In the Netherlands separate reference charts have been developed for native and immigrant groups to deal with differences in growth patterns in later childhood. The use of these charts, however, is complicated by methodological issues; they do not represent all large Dutch immigrant groups in separate charts despite the differences that have been suggested and the evidence of ethnic disparities in growth dates back to 1997. AIM: Anthropometric measurements from a contemporary multi-ethnic cohort study were created to quantify differences in childhood growth by creating growth charts, separately for boys and girls between the ages of 0-3 years. SUBJECTS AND METHODS: The infants modelled in the charts had a mother born in the Netherlands (n = 3107), Suriname (n = 225), Turkey (n = 203) and Morocco (n = 336). Charts with and without correction for country of origin of the mother were created by using the LMST method. RESULTS: All models including the covariate country of origin of the mother fitted the data better (p < 0.0005), but the observed differences were small. CONCLUSION: Most remarkable differences were found in the BMI and weight measurements for age charts. Especially girls from mothers born in Turkey and Morocco had an increasingly heavier weight for their age than girls from mothers born in the Netherlands.

Maternal long-chain polyunsaturated fatty acid status during early pregnancy: Association with child behavioral problems and the role of autonomic nervous system activity.

BACKGROUND & AIMS: The prenatal environment, including availability of critical nutrients, has a profound impact on offspring development. The present study examined the association between maternal long-chain polyunsaturated fatty acid (LC-PUFA) status during pregnancy and later child behavioral problems at the age of 5-6 years. In light of evidence of autonomic nervous system (ANS) dysregulation in some behavioral problems, study further tested if the above association is statistically mediated by cardiac ANS activity. METHODS: Data was collected as part of the Amsterdam Born Children and their Development-study and complete data were available for 1717 mothers and their offspring. Maternal LC-PUFA status was assessed during early pregnancy (mean gestation = 12.7, SD = 2.5 weeks) and quantified as levels of docosahexenoic acid (DHA), arachidonic acid (AA), eicosapentaenoic acid (EPA), as well as the ratio of n-6:n-3 fatty acids. Child emotional problems and peer problems (internalizing problems), as well as conduct problems and inattention/hyperactivity (externalizing problems), were assessed using the Strengths and Difficulties Questionnaire as rated by the mother and teacher at 5-6 years. Child cardiac respiratory sinus arrhythmia (RSA), pre-ejection period (PEP), and heart rate (HR) were utilized as measures of ANS activity at 5-6 years. RESULTS: The results confirmed an association between maternal LC-PUFA status and internalizing behavioral problems as rated by the mother, as shown for DHA (ß = -0.11;p < 0.01), EPA (ß = -0.22;p < 0.05), and n-6:n-3 LC-PUFA (ß = 0.17;p < 0.01). Statistical mediation was only demonstrated for HR. No associations were observed between LC-PUFA status and externalizing behavioral problems. CONCLUSIONS: The present results are consistent with a role of maternal LC-PUFA status in internalizing behavioral problems as rated by the mother. These results were not observed when problem behavior was rated by the teacher. Analyses did not yield strong evidence supporting ANS activity as a possible mediator in this relationship.

Gestational diabetes mellitus among Sub-Saharan African and Surinamese women in the Netherlands.

AIM: We assessed the association between ethnicity and the risk of gestational diabetes mellitus (GDM) in the Netherlands. METHODS: A cohort of 7815 women with known GDM status and ethnicity, including women of Sub-Saharan African ethnicity who are currently not identified as high-risk in guidelines. We compared GDM rates among participants of ethnicity to those of ethnic Dutch participants. We employed multivariable regression to correct for possible confounders, including maternal age, pre-pregnancy body mass index (BMI), and education. GDM prevalence and odds ratios based on ethnicity were the main outcome measures. RESULTS: The prevalence rates of GDM according to ethnicity were: Dutch 0.6%, South-Asian Surinamese 6.9%, African-Surinamese 3.5%, Antillean 1.0%, Turkish 1.0%, Moroccan 1.4%, Ghanaian 6.8%, Sub-Saharan African 3.5%, other Western 0.5% and other non-Western 2.8%. After adjustment for age, pre-pregnancy BMI, and education duration, compared with the reference Dutch-ethnicity population, adjusted odds ratios (aOR) for GDM were statistically significantly higher in South-Asian Surinamese (aOR 10.9; 95% Confidence Interval (CI), 4.7-25.0), African-Surinamese (4.3; 2.0-9.2), Ghanaian (6.5; 3.0-14.5), Sub-Saharan African (5.7; 2.0-16.0), and other non-Western women (4.5; 2.2-9.0). GDM was not significantly increased among Antillean (1.4; 0.2-10.3), Turkish (1.4; 0.4-4.2), Moroccan (1.8; 0.8-4.0), and other Western women (0.8; 0.3-2.2). CONCLUSIONS: This study shows for the first time in the Netherlands that women of Ghanaian or other Sub-Saharan African ethnicity have an increased risk of developing GDM than the Dutch. This calls for adaptation of the Dutch guidelines of screening high-risk groups for GDM and more awareness amongst obstetric caregivers.

Risk factors for the presence of non-rhesus D red blood cell antibodies in pregnancy.

OBJECTIVE: To identify risk factors for the presence of non-rhesus D (RhD) red blood cell (RBC) antibodies in pregnancy. To generate evidence for subgroup RBC antibody screening and for primary prevention by extended matching of transfusions in women <45 years. DESIGN: Case-control study. SETTING: Nationwide evaluation of screening programme for non-RhD RBC antibodies. CASES: consecutive pregnancies (n=900) with non-RhD immunisation identified from 1 September 2002 to 1 June 2003 and 1 October 2003 to 1 July 2004; controls (n=968): matched for obstetric caregiver and gestational age. METHODS: Data collection from the medical records and/or from the respondents by a structured phone interview. MAIN OUTCOME MEASURES: Significant risk factors for non-RhD immunisation in multivariate analysis. RESULTS: Significant independent risk factors: history of RBC transfusion (OR 16.7; 95% CI: 11.4-24.6), parity (para-1 versus para-0: OR 1.3; 95% CI: 1.0-1.7; para-2 versus para-0: OR 1.4; 95% CI: 1.0-2.0; para >2 versus para-0: OR 3.2; 95% CI: 1.8-5.8), haematological disease (OR 2.1; 95% CI: 1.0-4.2), history of major surgery (OR 1.4; 95% CI: 1.1-1.8). For the clinically most important antibodies, anti-K, anti-c and other Rh-nonD-antibodies RBC transfusion was the most important risk factor, especially for anti-K (OR 96.4; 95%-CI: 56.6-164.1); 83% of the K-sensitised women had a history of RBC transfusion. Pregnancy-related risk factors were a prior male child (OR 1.7; 95% CI: 1.2-2.3) and caesarean section (OR 1.7; 95% CI: 1.1-2.7). CONCLUSIONS: RBC transfusion is by far the most important independent risk factor for non-RhD immunisation in pregnancy, followed by parity, major surgery and haematological disease. Pregnancy-related risk factors are a prior male child and caesarean section. Subgroup screening for RBC antibodies, with exclusion of RhD-positive para-0 without clinical risk factors, is to be considered. This approach will be equally sensitive in detecting severe Haemolytic Disease of the Fetus and Newborn compared with the present RBC antibody screening programme without preselection. Primary prevention by extending preventive matching of transfusions in women younger than 45 will prevent more than 50% of pregnancy immunisations.

Risk factors for RhD immunisation despite antenatal and postnatal anti-D prophylaxis.

OBJECTIVE: To identify risk factors for Rhesus D (RhD) immunisation in pregnancy, despite adequate antenatal and postnatal anti-D prophylaxis in the previous pregnancy. To generate evidence for improved primary prevention by extra administration of anti-D Ig in the presence of a risk factor. DESIGN: Case-control study. SETTING: Nation-wide evaluation of the Dutch antenatal anti-D-prophylaxis programme. CASES: 42 RhD-immunised parae-1, recognised by first-trimester routine red cell antibody screening in their current pregnancy, who received antenatal and postnatal anti-D Ig prophylaxis (gifts of 1000 iu) in their first pregnancy. CONTROLS: 339 parae-1 without red cell antibodies. METHODS: Data were collected via obstetric care workers and/or personal interviews with women. MAIN OUTCOME MEASURE: Significant risk factors for RhD immunisation in multivariate analysis. RESULTS: Independent risk factors were non-spontaneous delivery (assisted vaginal delivery or caesarean section) (OR 2.23; 95% CI:1.04-4.74), postmaturity (>or=42 weeks of completed gestation: OR 3.07; 95% CI:1.02-9.02), pregnancy-related red blood cell transfusion (OR 3.51; 95% CI:0.97-12.7 and age (OR 0.89/year; 95% CI:0.80-0.98). In 43% of cases, none of the categorical risk factors was present. CONCLUSIONS: In at least half of the failures of anti-D Ig prophylaxis, a condition related to increased fetomaternal haemorrhage (FMH) and/or insufficient anti-D Ig levels was observed. Hence, RhD immunisation may be further reduced by strict compliance to guidelines concerning determination of FMH and accordingly adjusted anti-D Ig prophylaxis, or by routine administration of extra anti-D Ig after a non-spontaneous delivery and/or a complicated or prolonged third stage of labour.

Is psychosocial stress in first ongoing pregnancies associated with pre-eclampsia and gestational hypertension?

OBJECTIVE: Investigating the association of pre-eclampsia and gestational hypertension with psychosocial stress in the first half of pregnancy. DESIGN: Prospective community-based cohort study. SETTING: Amsterdam, The Netherlands. POPULATION: Between January 2003 and March 2004, all pregnant Amsterdam women (n = 12 377) were invited to fill in a questionnaire with sociodemographic and psychosocial variables (response rate 67%). Only nulliparous women with a singleton pregnancy, who completed the questionnaire before 24 weeks, and delivered after 24 weeks, were included. METHODS: A postpartum questionnaire was used to gather information on hypertension or proteinuria. If this questionnaire was not available, the national obstetric register was used for pregnancy outcome. Medical files were examined for women with hypertension and/or proteinuria to confirm the diagnosis of pre-eclampsia and gestational hypertension according to the International Society for the Study of Hypertension in Pregnancy guidelines. Psychosocial stress was defined as workstress (Work Experience and Appreciation Questionnaire partly based on the Job Content Instrument of Karasek et al.), anxiety (the State-Trait Anxiety Inventory), depression (Center for Epidemiological Studies Depression Scale) and pregnancy-related anxiety (PRAQ-R). The association of psychosocial stress with the incidence of pre-eclampsia and gestational hypertension was explored by multivariate analysis adjusted for sociodemographic and medical confounders. MAIN OUTCOME MEASURES: Incidence of pre-eclampsia and gestational hypertension. RESULTS: A total of 3679 women were included. The incidence of pre-eclampsia and gestational hypertension was 3.5 and 4.4%, respectively. Workstress, anxiety, pregnancy-related anxiety or depression had no effect on the incidence of pre-eclampsia or gestational hypertension. CONCLUSION: Psychosocial stress in the first half of pregnancy does not influence the incidence of pre-eclampsia and gestational hypertension in nulliparous women.

Women's attitude towards prenatal screening for red blood cell antibodies, other than RhD.

BACKGROUND: Since July 1998 all Dutch women (+/- 200,000/y) are screened for red cell antibodies, other than anti-RhesusD (RhD) in the first trimester of pregnancy, to facilitate timely treatment of pregnancies at risk for hemolytic disease of the fetus and newborn (HDFN). Evidence for benefits, consequences and costs of screening for non-RhD antibodies is still under discussion. The screening program was evaluated in a nation-wide study. As a part of this evaluation study we investigated, according to the sixth criterium of Wilson and Jüngner, the acceptance by pregnant women of the screening program for non-RhD antibodies. METHODS: Controlled longitudinal survey, including a prenatal and a postnatal measurement by structured questionnaires. MAIN OUTCOME MEASURES: information satisfaction, anxiety during the screening process (a.o. STAI state inventory and specific questionnaire modules), overall attitude on the screening program. Univariate analysis was followed by standard multivariate analysis to identify significant predictors of the outcome measures. PARTICIPANTS: 233 pregnant women, distributed over five groups, according to the screening result. RESULTS: Satisfaction about the provided information was moderate in all groups. All screen- positive groups desired more supportive information. Anxiety increased in screen- positives during the screening process, but decreased to basic levels postnatally. All groups showed a strongly positive balance between perceived utility and burden of the screening program, independent on test results or background characteristics. CONCLUSION: Women highly accept the non-RhD antibody screening program. However, satisfaction about provided information is moderate. Oral and written information should be provided by obstetric care workers themselves, especially to screen-positive women.

Maternal verbally aggressive behavior in early infancy is associated with blood pressure at age 5-6.

Early life stress has been shown to contribute to alterations in biobehavioral regulation. Whereas many different forms of childhood adversities have been studied in relation to cardiovascular outcomes, very little is known about potential associations between caregivers' verbally aggressive behavior and heart rate and blood pressure in the child. This prospective study examined whether maternal verbally aggressive behavior in early infancy is associated with heart rate or blood pressure at age 5-6. In the Amsterdam Born Children and their Development study, a large prospective, population-based birth cohort, maternal verbally aggressive behavior was assessed by questionnaire in the 13th week after birth. The child's blood pressure and heart rate were measured during rest at age 5-6 (n=2553 included). Maternal verbally aggressive behavior in infancy was associated with a higher systolic blood pressure (SBP) both in supine and sitting position after adjustment for sex, height and age (SBP supine B=1.01 mmHg; 95% CI [0.06; 1.95] and SPB sitting B=1.29 mmHg; 95% CI [0.12; 2.46]). Adjustment for potential confounding variables, such as other mother-infant dyad aspects, family hypertension and child's BMI, only slightly attenuated the associations (SBP supine B=0.99 mmHg; 95% CI [0.06; 1.93] and SPB sitting B=1.11 mmHg; 95% CI [-0.06; 2.27]). Maternal verbally aggressive behavior was not associated with diastolic blood pressure or heart rate at age 5-6. Maternal verbally aggressive behavior might be an important early life stressor with negative impact on blood pressure later in life, which should be further investigated. Possible underlying mechanisms are discussed.