In total, the results highlight that health-related quality of
life in the IG improved more than in the WLC during the
course of the study (see Table 5). A two-factorial analysis of
variance with repeated measures showed significant interactions
(group × time) for physical functioning [F(2;54) 0
14.88; p < 0.001], psychological functioning [F(2;54) 0
6.37; p 0 0.003], social functioning [F(1.62;43.78) 0 3.61;
p 0 0.044], and school functioning [F(1.45;39.01) 0 5.77;
p 0 0.012]. Post hoc analyses showed that changes from T1
to T2 were significant for all scales. Furthermore, a significant
main effect by group emerged for physical functioning
[F(1;27) 0 13.27; p 0 0.001] and school functioning
[F(1;27) 0 4.51; p 0 0.043]. Over time, no significant
changes occurred in the WLC for any of the scales. With
respect to the changes from T1 to T2 and T1 to T3, group
differences can assumed to be within the high range with effect
sizes of d 0 0.69 to d 0 2.17. As expected effect sizes were
lower concerning the changes from T2 to T3. As expected
effect sizes were lower concerning the changes from T2 to T3.