Table 3

Outcome of the mental training programme intervention

3 months after baseline15 months after baseline
Intention to treatPer protocolIntention to treatPer protocol
CFQ—total sum score
 Treatment group, mean18.819.015.414.3
 Control group, mean20.520.318.118.1
 Difference (95% CI)−1.8 (−6.4 to 2.9)−1.4 (−5.3 to 2.6)−2.7 (−8.5 to 3.2)−3.8 (−9.6 to 2.1)
Postexertional malaise—score
 Treatment group, mean2.62.42.01.7
 Control group, mean3.02.92.42.1
 Difference (95% CI)−0.4 (−1.1 to 0.4)−0.5 (−1.1 to 0.01)−0.4 (−1.1 to 0.4)−0.4 (−1.0 to 0.3)
BPI—total sum score
 Treatment group, mean12.410.713.012.9
 Control group, mean12.212.411.711.0
 Difference (95% CI)0.2 (−5.3 to 5.7)−1.7 (−5.1 to 1.6)1.4 (−4.5 to 7.3)1.9 (−2.5 to 6.3)
KSQ—total sum score
 Treatment group, mean45.844.242.141.1
 Control group, mean46.747.944.444.6
 Difference (95% CI)−0.9 (−9.9 to 8.1)−3.8 (−10.9 to 3.4)−2.4 (−14.7 to 10.0)−3.5 (−14.4 to 7.4)
HADS—total sum score
 Treatment group, mean14.413.912.010.0
 Control group, mean14.614.213.312.4
 Difference (95% CI)−0.2 (−5.0 to 4.5)−0.3 (−3.8 to 3.2)−1.3 (−7.2 to 4.6)−2.4 (−6.0 to 1.3)
PedsQL—total average score
 Treatment group, mean66.269.872.475.9
 Control group, mean64.966.671.774.4
 Difference (95% CI)1.3 (−9.5 to 12.0)3.2 (−4.1 to 10.5)0.7 (−14.1 to 15.4)1.4 (−9.2 to 12.0)
FDI—total sum score
 Treatment group, mean12.711.011.47.4
 Control group, mean12.112.810.510.7
 Difference (95% CI)0.6 (−4.3 to 5.5)−1.8 (−5.5 to 1.9)0.9 (−6.5 to 8.3)−3.3 (−9.0 to 2.4)
Steps per day—number
 Treatment group, mean7217619856807540
 Control group, mean8515825775877782
 Difference (95% CI)−1298 (−4874 to 2278)−2059 (−3698 to −421)−1908 (−9853 to 6037)−242 (−2944 to 2460)
  • All analyses in the intention to treat columns are based on multiple imputation (55 iterations). Means and differences 3 months and 15 monhts after baseline are estimated from the parameters of the general linear model. Model diagnostics was performed by visual inspection of residual plots.

  • BPI, Brief Pain Inventory; CFQ, Chalder Fatigue Questionnaire; FDI, Functional Disability Inventory; HADS, Hospital Anxiety and Depression Scale; KSQ, Karolinska Sleep Questionnaire; PedsQL, Paediatric Quality of Life inventory.