Table 3

Estimated group means and tests of effects, taken from a multilevel analysis of the secondary outcome measures using an intention to treat approach

Estimated group meansTests of effectsCohen’s d between groups
InterventionControlGroupTimeGroup * Time
MeanSE95% CIMeanSE95% CIFP valuedfFP valuedfFP valuePostFollow-up
Baseline18.340.7516.87 to 19.8117.770.6616.48 to 19.07
Post16.950.7015.56 to 18.3418.230.6616.93 to 19.53
Follow-up17.640.7816.10 to 19.1817.630.7016.25 to 19.01
SMBQ Tense0.050.82191.852.780.07148.940.890.410.030.14
Baseline3.830.133.58 to 4.083.750.123.51 to 3.99
Post3.660.143.38 to 3.943.690.143.42 to 3.96
Follow-up3.820.153.54 to 4.113.980.133.72 to 4.24
SMBQ Listlessness1.990.16190.880.590.56150.502.890.060.390.15
Baseline4.060.133.81 to 4.314.110.123.88 to 4.35
Post3.810.123.57 to to 4.45
Follow-up3.990.143.72 to to 4.41
Baseline5.340.204.94 to 5.745.270.194.89 to 5.65
Post4.910.234.46 to 5.365.360.214.94 to 5.79
Follow-up5.000.234.54 to 5.455.510.215.10 to 5.93
  • Factor labels in tests of effects: Group=Intervention vs Control, Time=Baseline vs Post vs Follow-up. Df (df) for Time and Group*time are identical.

  • DBAS, Dysfunctional Beliefs and Attitudes about Sleep, 0 do not agree—10 do fully agree; Mean, modelled mean values; PSS, Perceived Stress Scale, 0 never—40 very often; SMBQ, Shirom-Melamed Burn-out Questionnaire.