Body Mass Index Is a Better Indicator of Body Composition than Weight-for-Length at Age 1 Month.
J Pediatr
; 204: 77-83.e1, 2019 01.
Article
em En
| MEDLINE
| ID: mdl-30268397
ABSTRACT
OBJECTIVE:
To assess whether body mass index (BMI) provides a better assessment of measured adiposity at age 1 month compared with weight-for-length (WFL). STUDYDESIGN:
Participants were healthy term-born infants in the Infant Growth and Microbiome (n = 146) and the Baby Peas (n = 147) studies. Length, weight, and body composition by air displacement plethysmography were measured at 1 month. World Health Organization-based WFL and BMI z-scores were calculated. Within-cohort z-scores of percent fat-Z, fat mass-Z, fat mass/length2-Z, fat mass/length3-Z, fat-free mass-Z, and fat-free mass/length2-Z were calculated. Correlation and multiple linear regression (adjusted for birth weight) analyses tested the associations between body composition outcomes and BMI-Z vs WFL-Z. Quantile regression was used to test the stability of these associations across the distribution of body compositions.RESULTS:
The sample was 52% female and 56% African American. Accounting for birth weight, both BMI-Z and WFL-Z were strongly associated with fat mass-Z (coefficients 0.56 and 0.35, respectively), FM/L2-Z (0.73 and 0.51), and FM/L3-Z (0.79 and 0.58), with stronger associations for BMI-Z compared with WFL-Z (P < .05). Even after accounting statistically for birth weight, BMI-Z was persistently more strongly associated than WFL-Z with body composition outcomes across the distribution of body composition outcomes.CONCLUSIONS:
We demonstrate in 2 distinct cohorts that BMI is a better indicator of adiposity in early infancy compared with WFL. Our findings support the preferred use of BMI for growth and nutritional status assessment in infancy.Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Pletismografia
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Composição Corporal
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Índice de Massa Corporal
Tipo de estudo:
Etiology_studies
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Incidence_studies
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Observational_studies
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Prevalence_studies
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Risk_factors_studies
Limite:
Female
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Humans
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Infant
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Male
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Newborn
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article