Associations of childcare type, age at start, and intensity with body mass index trajectories from 10 to 42 years of age in the 1970 British Cohort Study

摘要

Background Attending childcare is related to greater childhood obesity risk, but there are few long-term follow-up studies. We aimed to examine the associations of childcare type, age at start, and intensity with body mass index body mass index (BMI) trajectories from ages 10 to 42 years. Methods The sample comprised 8234 individuals in the 1970 British Cohort Study, who had data on childcare attendance (no, yes), type (formal, informal), age at start (4‐5, 3‐3.99, 0‐2.99?years old), and intensity (1, 2, 3, 4‐5?days/week) reported at age 5?years and 32?563 BMI observations. Multilevel linear spline models were used to estimate the association of each exposure with the sample‐average BMI trajectory, with covariate adjustment. A combined age at start and intensity exposure was also examined.