Table 4. Association between hours of sleep and changes in BMI z-score: crude and adjusted models.

Sleep duration	Crude model Coefficient (95%CI)	Adjusted model* Coefficient (95%CI)
Overall sample
Hours of sleep	0.01 (-0.01; 0.04)	0.01 (-0.01; 0.04)
By sex: boys
Hours of sleep	0.05 (0.03; 0.08)	0.05 (0.02; 0.08)
By sex: girls
Hours of sleep	-0.02 (-0.05; 0.00)	-0.02 (-0.05; 0.01)

Linear mixed models were used taking into account the variation of hours of sleep over time.

^*Adjusted by age, sex, socioeconomic status, household location, maternal education, number of meals the previous day, physical activity during last week, and maternal BMI. Sex was excluded from the model in stratified analysis.