Peer-Reviewed Journal Details
Mandatory Fields
Meller, FD;Assuncao, MCF;Schafer, AA;de Mola, CL;Barros, AJD;Dahly, DL;Barros, FC
2015
July
British Journal of Nutrition
The influence of birth order and number of siblings on adolescent body composition: evidence from a Brazilian birth cohort study
Validated
Optional Fields
SCHOOL-CHILDREN OVERWEIGHT OBESITY SCHOOLCHILDREN DETERMINANTS ADIPOSITY VARIABLES HEIGHT SIZE RISK
114
118
125
The aim of this study was to estimate the association between birth order and number of siblings with body composition in adolescents. Data are from a birth cohort study conducted in Pelotas, Brazil. At the age of 18 years, 4563 adolescents were located, of whom 4106 were interviewed (follow-up rate 81.3 %). Of these, 3974 had complete data and were thus included in our analysis. The variables used in the analysis were measured during the perinatal period, or at 11, 15 and/or 18 years of age. Body composition at 18 years was collected by air displacement plethysmography (BOD POD (R)). Crude and adjusted analyses of the association between birth order and number of siblings with body composition were performed using linear regression. All analyses were stratified by the adolescent sex. The means of BMI, fat mass index and fat-free mass index among adolescents were 23.4 (SD 4.5) kg/m(2), 6.1 (SD 3.9) kg/m(2) and 17.3 (SD 2.5) kg/m(2), respectively. In adjusted models, the total siblings remained inversely associated with fat mass index (beta = -0.37 z-scores, 95% CI -0.52, -0.23) and BMI in boys (beta = -0.39 z-scores, 95% CI -0.55, -0.22). Fat-free mass index was related to the total siblings in girls (beta = 0.06 z-scores, 95% CI -0.04, 0.17). This research has found that number of total siblings, and not birth order, is related to the fat mass index, fat-free mass index and BMI in adolescents. It suggests the need for early prevention of obesity or fat mass accumulation in only children.
CAMBRIDGE
0007-1145
10.1017/S0007114515001488
Grant Details