Cross-sectional associations (regression coefficients (b) and 95% confidence intervals (95% CI)) between weekday, weekend day and average sleep duration and BMI and WC in schoolchildren across Europe.

Model 1: Adjusted for age, gender, parental BMI, parental education, parental employment, biological background of the parents, family composition, home-situation, television in bedroom and set daily routine for bedtime;Model 2: Additionally adjusted for frequency of taking breakfast, sugared drink consumption, physical activity and screen time;Model 3: Additionally adjusted for weekend (A) or week (B) sleep duration.Note that model 3 was not run for average sleep duration, since it comprises both weekday and weekend day sleep duration.* = Significant association between weekday or weekend day sleep duration (hr) and BMI/WC.