Sleep, physical activity and BMI in six to ten-year-old children measured by accelerometry: a cross-sectional study

Table 1 Results from mixed ANOVA model and marginal means for intervetion-by-weekend interaction

Fixed effects	Sleep onset (hour)		Sleep end (hour)		TST (min)		Sleep efficiency (%)
	chi2	p	chi2	p	chi2	p	chi2	p
intervention	1.6	.210	1.3	.250	0.3	.565	0.0	.865
weekend	379	<.001	295.1	<.001	15.7	<.001	8.9	.003
intervention *weekend	0.0	.980	1.9	.742	0.1	.723	0.2	.686
Random effects	*est*	SE	*est*	SE	*est*	SE	*est*	SE
actiwatch (sd)	0.0	0,0	0,0	0.0	0.0	0.00	0.27	0.20
subject (sd)	0.52	0.02	0,36	0.02	0.38	0.01	3.32	0.08
ar1 (rho)	0.19	0.01	0,19	0.01	-0.04	0.01	0.11	0.02
residual (sd)	0.86	0.01	0,77	0.01	0.79	0.01	3.11	0.03
	Sleep onset		Sleep end		TST		Sleep efficiency
Marginal means	*Mean*	SE	*Mean*	SE	*Mean*	SE	*Mean*	SE
control / weekdays	21.4	0.03	7.0	0.02	9.6	0.02	85.7	0.16
boys in weekend	21.8	0.03	7.3	0.03	9.5	0.03	85.4	0.17
girls on weekdays	21.5	0.03	7.0	0.02	9.6	0.02	85.7	0.16
girls in weekend	21.9	0.03	7.4	0.03	9.5	0.03	85.5	0.17

Abbreviations: chi2 chi-square test statistic, p p-value, mean estimated marginal mean of groups, SE standard error of estimated marginal mean, sd standard deviation of random effect, rho autoregressive correlation of residuals. Note: weekend is defined as Friday and Saturday, weekdays are Sunday-Thursday. n = 1,160 individuals and 7,164 observations of sleep data.

ISSN: 1479-5868