Table 2.
Results and effect sizes (Cohen’s d) for the Center for Epidemiological Studies Depression scale (CES-D) for completers and adherent completers, and for intention-to-treat (ITT) analyses.
| Program | Test time, n; mean (SD) | Within-group effect size, d (95% CI) | Between-group effect size, d (95% CI) | |||||||
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Pretest | Posttest | Follow-up | Pre-post | Pre–follow-upa | Program | Posttest | Follow-up (95% CI) |
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| Completers of posttest (n=549) and/or follow-up (n=336) |
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IPT | 206; 35.65 (11.85) | 206; 26.22 (12.92) | 129; 22.41 (13.84) | 0.76 (0.56,0.96) | 1.02 (0.76,1.28) | IPT vs MoodGYM | 0.14 (–0.06,0.35)b | 0.18 (–0.09,0.45)b | |
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CBT | 181; 34.46 (11.31) | 181; 23.68 (13.34) | 115; 18.17 (12.15) | 0.87 (0.65,1.0 9) | 1.44 (1.15,1.72) | CBT vs MoodGYM | 0.05 (–0.17,0.26)c | 0.12 (–0.15,0.39)c | |
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MoodGYM | 162; 35.19 (12.44) | 162; 24.30 (14.10) | 92; 19.79 (14.92) | 0.82 (0.59,1.04) | 1.04 (0.72,1.34) |
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| Adherent completers of posttest (n=476) and/or follow-up (n=294) |
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IPT | 192; 35.60 (11.79) | 192; 26.38 (13.25) | 119; 22.50 (13.55) | 0.74 (0.53,0.94) | 1.02 (0.74,1.28) | IPT vs MoodGYM | 0.23 (0.0,0.46)b | 0.31 (0.02,0.60)b | |
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CBT | 158; 34.30 (11.79) | 158; 23.09 (13.25) | 101; 17.75 (13.55) | 0.89 (0.65,1.11) | 1.33 (1.02,1.63) | CBT vs MoodGYM | 0.02 (–0.25,0.22)c | 0.04 (–0.26,0.34)c | |
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MoodGYM | 126; 34.41 (11.32) | 126; 23.33 (13.25) | 74; 18.30 (13.55) | 0.90 (0.64,1.16) | 1.21 (0.86,1.56) |
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| ITT posttest and follow-up (N=1843) |
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IPT | 620; 36.38 (11.51) | 620; 26.59 (20.27) | 620; 23.17 (25.60) | 0.59 (0.48,0.71) | 0.67 (0.55,0.78) | IPT vs MoodGYM | 0.09 (–0.02,0.21)b | 0.09 (–0.02,0.21)b | |
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CBT | 610; 36.29 (11.51) | 610; 24.80 (21.34) | 610; 19.68 (26.85) | 0.67 (0.55,0.79) | 0.80 (0.69,0.92) | CBT vs MoodGYM | 0.01 (–0.10,0.12)b | 0.03 (–0.08,0.14)c | |
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MoodGYM | 613; 35.34 (11.52) | 613; 24.58 (22.43) | 613; 20.56 (29.69) | 0.60 (0.49,0.72) | 0.66 (0.54,0.77) |
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aWithin-group follow-up effect size for completers is based upon the following pretest scores: IPT (n=129, mean 35.66, SD 12.05); CBT (n=115, mean 34.89, SD 11.05); MoodGYM (n=92, mean 34.13, SD 12.65); within-group follow-up effect size for adherent completers is based upon the following pretest scores: IPT (n=119, mean 35.48, SD 11.91); CBT (n=101, mean 34.68, SD 11.90); MoodGYM (n=74, mean 33.77, SD 11.92).
bIn favor of MoodGYM.
cIn favor of CBT.