Table 2.
Descriptive statistics: depression and social functioning
| Immediate-treatment group M (SD), N |
Delayed-treatment group M (SD), N |
Mean comparisons and effect size (between-groups Cohen’s d) | |
| Depression (BDI) | |||
| T0 (baseline) | 26.72 (9.86), 320 | 27.11 (8.98), 76 | t (394) = .31, P = .76 (d = .04) |
| T1 (9 weeks) | 19.87 (11.85), 159 | 27.15 (10.01), 57 | t (214) = 4.14, P < .001 (d = .64) |
| T2 (18 weeks) | 17.23 (11.85), 111 | 20.39 (12.92), 35 | t (144) = 1.34, P = .18 (d = .25) |
| T3 (27 weeks)a | 19.07 (15.32), 25 | ||
| T4 (6-months follow-up) | 16.50 (12.93), 85 | 15.25 (14.80), 14 | t (97) = -.33, P = .74 (d = .09) |
| Social Dysfunction (WSA) | |||
| T0 (baseline) | 5.66 (1.66), 315 | 5.89 (1.50), 75 | t (388) = 1.10, P = .27 (d = .15) |
| T1 (9 weeks) | 4.80 (2.14), 154 | 6.06 (1.42), 57 | t (209) = 4.11, P < .001 (d = .64) |
| T2 (18 weeks) | 4.48 (2.26), 109 | 4.65 (1.92), 34 | t (141) = .40, P = .69 (d = .08) |
| T3 (27 weeks)a | 4.86 (2.30), 24 | ||
| T4 (6-months follow-up) | 4.10 (2.41), 83 | 4.07 (2.74), 12 | t (93) = -.04, P = .97 (d = .01) |
aAt the T3 data-collection time-point, questionnaires were administered only to the delayed-treatment group, given that this constituted the 9-week post-treatment follow-up for that group.