Andrew W Tu1, Louise C Mâsse1, Scott A Lear2, Carolyn C Gotay1, Chris G Richardson1. 1. School of Population and Public Health, University of British Columbia, Vancouver, British Columbia, Canada. 2. Faculty of Health Sciences, Simon Fraser University, Vancouver, British Columbia, Canada.
Abstract
OBJECTIVE: In this study, unique body mass index (BMI) trajectories from ages 1 to 20 years were identified; each trajectory according to socio demographic and family characteristics was described. METHODS: Participants came from two national population surveys (n = 7,253; n = 901) and were aged 1-6 years at baseline. Children were surveyed biennially over eight waves up to 14-20 years of age. BMI trajectories by sex and survey cohort were identified by group-based trajectory modeling. After crossvalidating trajectories between survey cohorts, the characteristics of trajectory membership were assessed by multinomial regression. RESULTS: Four BMI trajectories were found: low, decreasing, medium, and high. The decreasing trajectory was characterized by an overweight or obese childhood followed by a normal-weight adolescence. The low, medium, and high trajectories were characterized by growth curves culminating, by age 20, to BMI 22.6, 29.3, and 34.9 kg/m(2) , respectively, for males and 20.6, 24.5, and 32.0 kg/m(2) , respectively, for females. Factors associated with the high trajectory included ethnicity and paternal education (female only), large for gestational age, rural area residence, and maternal smoking. CONCLUSIONS: The identification and validation of four major trajectories reflect the heterogeneity in patterns of BMI development from 1 to 20 years.
OBJECTIVE: In this study, unique body mass index (BMI) trajectories from ages 1 to 20 years were identified; each trajectory according to socio demographic and family characteristics was described. METHODS:Participants came from two national population surveys (n = 7,253; n = 901) and were aged 1-6 years at baseline. Children were surveyed biennially over eight waves up to 14-20 years of age. BMI trajectories by sex and survey cohort were identified by group-based trajectory modeling. After crossvalidating trajectories between survey cohorts, the characteristics of trajectory membership were assessed by multinomial regression. RESULTS: Four BMI trajectories were found: low, decreasing, medium, and high. The decreasing trajectory was characterized by an overweight or obese childhood followed by a normal-weight adolescence. The low, medium, and high trajectories were characterized by growth curves culminating, by age 20, to BMI 22.6, 29.3, and 34.9 kg/m(2) , respectively, for males and 20.6, 24.5, and 32.0 kg/m(2) , respectively, for females. Factors associated with the high trajectory included ethnicity and paternal education (female only), large for gestational age, rural area residence, and maternal smoking. CONCLUSIONS: The identification and validation of four major trajectories reflect the heterogeneity in patterns of BMI development from 1 to 20 years.
Authors: Soyang Kwon; Kathleen F Janz; Elena M Letuchy; Trudy L Burns; Steven M Levy Journal: Obesity (Silver Spring) Date: 2016-11-02 Impact factor: 5.002
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