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Table 2 Results from the mixed ANOVA-model and marginal means for age-by-gender-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 Sleep end TST Sleep efficiency
  chi2 p chi2 p chi2 p chi2 p
sex 5.2 .022 1.2 .267 21.0 <.001 0.3 .572
age 122.2 <.001 11.3 .010 126.1 <.001 20.9 <.001
weekend 353.2 <.001 295.1 <.001 18.0 <.001 7.1 .008
sex*age 1.5 .677 1.9 .595 0.7 .883 1.3 .725
sex*weekend 0.9 .350 2.1 .146 0.3 .579 3.2 .072
age*weekend 5.9 .117 6.9 .074 7.9 .048 3.3 .352
sex*age*weekend 5.4 .144 1.6 .651 6.2 .101 2.4 .497
Random effects est SE est SE est SE est SE
actiwatch (sd) 0.009 0.00 0.0 0.00 0.0 0.00 0.31 0.20
subject (sd) 0.490 0.02 0.36 0.02 0.34 0.01 3.29 0.08
as1 (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 Age Mean se Mean SE Mean SE Mean SE
Boys on weekdays 6 21.3 0.06 7.0 0.05 9.8 0.05 84.7 0.35
  7 21.3 0.05 7.0 0.04 9.6 0.04 85.3 0.28
  8 21.6 0.06 7.0 0.05 9.5 0.04 85.7 0.33
  9 21.7 0.05 7.1 0.04 9.3 0.04 86.3 0.27
Boys in weekend 6 21.5 0.08 7.2 0.07 9.7 0.06 84.6 0.39
  7 21.7 0.06 7.2 0.05 9.5 0.05 85.2 0.31
  8 22.1 0.07 7.3 0.06 9.2 0.06 85.8 0.36
  9 22.1 0.06 7.5 0.05 9.3 0.05 86.1 0.30
Girls on weekdays 6 21.1 0.06 7.0 0.05 9.9 0.04 85.3 0.33
  7 21.3 0.05 7.0 0.04 9.7 0.04 85.6 0.29
  8 21.5 0.05 7.0 0.04 9.5 0.04 85.8 0.31
  9 21.6 0.05 7.1 0.04 9.4 0.04 86.3 0.28
Girls in weekend 6 21.5 0.07 7.3 0.06 9.8 0.06 85.1 0.37
  7 21.7 0.06 7.3 0.05 9.6 0.05 84.9 0.32
  8 21.9 0.07 7.4 0.06 9.5 0.05 85.7 0.34
  9 22.0 0.06 7.5 0.05 9.4 0.05 85.9 0.31
  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.