The effects of birth weight and postnatal linear growth retardation on body mass index, fatness and fat distribution in mid and late childhood

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Abstract
To determine the effects of birth weight and early childhood stunting on body mass index (BMI), body fat and fat distribution at ages 7 and 11 years, and the change from 7 to 11 years. Prospective cohort study Kingston, Jamaica. One hundred and sixteen stunted children (height-for-age below two standard deviations (<-2SD) of the National Center for Health Statistics (NCHS) references) and 190 non-stunted children (height-for-age > -1SD), identified at age 9-24 months. The stunted group was divided into a previously stunted group (height-for-age at 11 years >or= -1SD) and a chronically stunted group (height-for-age < -1SD). Birth weight was positively related to the children's BMI but not to measures of body fat. Birth weight was negatively associated with the subscapular/triceps skinfold (SSF/TSF) ratio at age 11 years, and to the change between 7 and 11 years. Controlling for birth weight, the chronically stunted group remained significantly smaller than the non-stunted children at both ages and increased less from 7 to 11 years in all measures except the SSF/TSF ratio, which was significantly greater at age 7 years. The previously stunted group had significantly lower BMI and percentage body fat at age 7 years than the non-stunted group. Change from 7 to 11 years was not significantly different from that of the non-stunted group except for a smaller increase in TSF. At age 11 years they had significantly lower TSF and percentage body fat. Children stunted in early childhood had less fat and lower BMI than non-stunted children but had a more central fat distribution that was partially explained by their lower birth weights. The association between birth weight and central fat distribution developed between 7 and 11 years.

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