Table 2

Means and SDs for the ITT sample (iSMI: n=59; AC: n=58) at pretreatment (T1) and post-treatment (T2), and 6 months follow-up (T3)

OutcomeT1T2*T3*
iSMIACiSMIACiSMIAC
MSDMSDMSDMSDMSDMSD
Primary outcome
 PSS-14 (0–56)33.225.2733.095.3424.395.9529.116.7022.527.2226.616.80
Mental health
 SMBQ (1–7)4.470.884.460.773.270.954.160.943.421.163.871.18
  Physical fatigue4.250.964.230.963.221.083.871.123.221.313.611.27
  Cognitive weariness4.611.064.530.983.881.234.281.213.671.253.761.12
  Tension5.041.074.910.854.111.244.531.093.871.274.271.28
  Listlessness4.281.354.441.203.311.434.061.223.051.423.771.50
 MADRS-S (0–54)15.716.3515.764.999.495.1114.646.7810.647.1712.596.57
 ISI (0–28)11.974.8711.105.548.264.789.955.048.374.3710.355.84
Work related
 WEMS (32–192)†123.6620.41124.4718.89136.6819.56124.6121.45128.6023.12126.2021.12
  Supportive work conditions (1–6)†4.020.834.040.714.380.754.150.794.230.954.270.79
  Internal work experience (1–6)†4.760.784.710.884.980.744.680.904.840.934.800.94
  Autonomy (1–6)†4.031.064.020.944.191.074.300.804.180.884.260.70
  Time experience (1–6)†2.151.102.111.002.591.282.391.222.611.252.611.22
  Management (1–6)†3.641.013.870.904.050.933.651.073.781.123.721.00
  Process of change (1–6)†3.761.273.711.154.231.173.671.253.891.223.741.27
 Absenteeism (TiC-P)‡2.001.153.812.984.433.692.701.953.502.324.250.96
 Presenteeism (TiC-P)‡4.543.754.354.204.042.185.265.094.353.445.575.21
AUDIT (0–40)3.422.213.812.53
  • *Missing data imputed by multiple imputation.

  • †Higher scores indicate better outcomes.

  • ‡In relation to the previous month.

  • AC, attention control; PSS-14, Perceived Stress Scale; SMBQ, Shirom-Melamed Burnout Questionnaire; MADRS-S, Montgomery Åsberg Depression Rating Scale-self-assessment; ISI, Insomnia Severity Index; ITT, intention to treat; iSMI, internet-based stress management intervention; WEMS, Work Experience Measurement Scale; AUDIT, Alcohol Use Disorders Identification Test; TiC-P, Trimbos and Institute of Medical Technology Assessment Cost Questionnaire for Psychiatry.