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

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

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
  1. 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.