Référence bibliographique 
Pryor, Laura E., Tremblay, Richard E., Boivin, Michel, Touchette, Évelyne, Dubois, Lise, Genolini, Christophe, Liu, Xuecheng, Falissard, Bruno et Côté, Sylvana. 2011. «Developmental Trajectories of Body Mass index in Early Childhood and Their Risk Factors: An 8-Year Longitudinal Study ». Archives of Pediatrics & Adolescent Medicine, vol. 165, no 10, p. 906-912.
The objectives of this article are «[t]o identify groups of children with distinct developmental trajectories of body mass index (BMI), calculated as weight in kilograms divided by height in meters squared, between the ages of 5 months and 8 years and identify early-life risk factors that distinguish children in an atypically elevated BMI trajectory group.» (p. 906)
The data for this study are from «[a] representative sample of children (N=2120) selected through birth registries for the Quebec Longitudinal Study of Child Development. Children for whom BMI data were available for at least 5 time points were retained in the present study (n=1957).» (p. 906)
Type de traitement des données :
«Studies evaluating the potential heterogeneity in the development of BMI during childhood are needed to describe the normative and atypical patterns that may emerge early in life.» (p. 906) «Our findings indicate that both maternal overweight/ obesity and maternal smoking during pregnancy were associated with membership in the high-rising trajectory of BMI.» (p. 909) «Three trajectories of BMI were identified: low-stable (54.5% of children), moderate (41.0%), and high-rising (4.5%). The high-rising group was characterized by an increasing average BMI, which exceeded international cutoff values for obesity by age 8 years. Two maternal risk factors were associated with the high-rising group as compared with the low-stable and moderate groups combined: maternal BMI [...] and maternal smoking during pregnancy […].Children continuing on an elevated BMI trajectory leading to obesity in middle childhood can be distinguished from children on a normative BMI trajectory as early as age 3.5 years. Important and preventable risk factors for childhood obesity are in place before birth.» (p. 906)