Table 4.
Change from T3 to follow-up (T4) with completer data for depression outcomes.
| Outcome and group | T3a | T4b | Test statistics (T3-T4) | Within group | |||||||||
|
|
n | Mean (SD) | n | Mean (SD) | F test (df1,df2) | P value | η 2 | T1−T4, Cohen d (95% CI) | |||||
| Beck Depression Inventory-II | |||||||||||||
|
|
Guided | 132 | 14.87 (8.77) | 64 | 15.92 (8.79) | 0.62 (1,194) | >.999 | .00 | 1.58 (1.29, 1.95) | ||||
|
|
Unguided | 116 | 15.86 (8.03) | 62 | 16.29 (6.47) | 0.13 (1,176) | >.999 | .00 | 1.88 (1.59, 2.24) | ||||
|
|
Control | 53 | 31.11 (8.30) | 29 | 38.28 (9.88) | 12.2 (1,80) | .002 | .13 | −0.72 (−1.35, −0.28) | ||||
| Quick Inventory of Depressive Symptomatology – Self Report | |||||||||||||
|
|
Guided | 132 | 6.53 (3.55) | 65 | 8.42 (4.80) | 9.67 (1,195) | .006 | .05 | 1.63 (1.31, 2.00) | ||||
|
|
Unguided | 116 | 6.84 (4.09) | 62 | 8.85 (5.23) | 8.05 (1,176) | .02 | .04 | 1.97 (1.60, 2.45) | ||||
|
|
Control | 53 | 20.15 (3.78) | 29 | 18.76 (5.14) | 1.96 (1,80) | .50 | .02 | −0.04 (−0.43, 0.37) | ||||
| Hamilton Rating Depression Scale | |||||||||||||
|
|
Guided | 123 | 11.46 (6.81) | 17 | 12.24 (7.02) | 0.19 (1,138) | >.999 | .00 | 1.65 (0.94, 2.63) | ||||
|
|
Unguided | 70 | 12.19 (6.57) | 6 | 9.83 (5.19) | 0.73 (1,74) | >.999 | .01 | 2.22 (1.81, 3.03) | ||||
|
|
Control | 80 | 20.91 (8.78) | 7 | 26.29 (4.15) | 2.55 (1,85) | .342 | .03 | −0.65 (−1.35, −0.09) | ||||
aT3 represents the end of the intervention (12 weeks after the start of the study).
bT4 represents the follow-up point (24 weeks after the start of the study).