Table 3. 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.

	(A) Week day		(B) Weekend day		(C) Average
Sleep duration (hr)	BMI	WC	BMI	WC	BMI	WC
Model 1
10	1.0	1.0	1.0	1.0	1.0	1.0
9	0.37 [0.16; 0.59]*	0.93 [0.27; 1.58]*	0.25 [0.03; 0.49]*	0.89 [0.30; 1.47]*	0.41 [0.18; 0.65]*	0.96 [0.45; 1.71]*
8	0.37 [0.15; 0.59]*	1.76 [0.95; 2.57]*	0.20 [−0.13; 0.65]	0.78 [−0.08; 1.65]	0.61 [0.28; 0.93]*	1.31 [1.02; 2.09]*
≤7	0.89 [0.36; 1.41]*	1.90 [0.42; 3.37]*	0.29 [−0.34; 1.10]	0.64 [−1.00; 2.28]	0.92 [0.21; 1.64]*	2.37 [1.02; 4.31]*
Model 2
10	1.0	1.0	1.0	1.0	1.0	1.0
9	0.37 [0.15; 0.59]*	0.98 [0.30; 1.66]*	0.30 [0.06; 0.53]*	0.89 [0.28; 1.50]*	0.44 [0.19; 0.69]*	1.06 [0.23; 1.71]*
8	0.68 [0.39; 0.96]*	1.56 [0.72; 2.39]*	0.15 [−0.19; 0.50]	0.59 [−0.30; 1.49]	0.64 [0.31; 0.98]*	1.20 [0.17; 2.09]*
≤7	0.90 [0.35; 1.45]*	1.87 [0.33; 3.41]*	0.43 [−0.22; 1.08]	0.87 [−0.84; 2.59]	0.98 [0.24; 1.73]*	2.35 [0.08; 4.31]*
Model 3
10	1.0	1.0	1.0	1.0	N/A	N/A
9	0.31 [0.081; 0.54]*	0.88 [0.17; 1.58]*	0.18 [−0.06; 0.42]	0.66 [0.04; 1.28]*	N/A	N/A
8	0.66 [0.36; 0.97]*	1.55 [0.66; 2.44]*	−0.06 [−0.41; 0.30]	0.17 [−0.76; 1.09]	N/A	N/A
≤7	0.86 [0.27; 1.45]*	1.99 [0.32; 3.65]*	0.14 [−0.54; 0.82]	0.27 [−1.52; 2.05]	N/A	N/A

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.