Table 4.
Results of repeated-measures ANOVAs and effect sizes for the primary efficacy measure at baseline, during treatment (3 weeks), and after treatment (6 weeks) for the 3 groups.
| Measure | Difference at 3 weeks, mean (95% CI), P value | Difference at 6 weeks, mean (95% CI), P value | P value | |||
|
|
|
Within group | Between group | Within group | Between group | Group×time interaction |
| YBOCSa | ||||||
|
|
ICBTb group | –5.56 (–7.33 to –3.79), <.001 | N/Ac | –8.78 (–10.95 to –6.61), <.001 | N/A | .001 |
|
|
ICBT group vs CBGTd group | N/A | –2.64 (–5.36 to 0.08), .06 | N/A | 0.10 (–3.12 to 3.32), .99 |
N/A |
|
|
ICBT group vs TAUe group | N/A | –1.56 (–4.17 to 1.05), .444 | N/A | –2.72 (–5.80 to 0.37), .103 | N/A |
|
|
CBGT group | –3.86 (–5.75 to –1.97), <.001 | N/A | –9.82 (–12.14 to –7.50), <.001 | N/A | N/A |
|
|
CBGT group vs TAU | N/A | 1.08 (–1.62 to 3.78), .993 | N/A | –2.82 (–6.02 to 0.37), .102 | N/A |
|
|
TAU group | –3.76 (–5.50 to –2.02), <.001 | N/A | –5.82 (–7.96 to –3.68), <.001 | N/A | N/A |
| FOCIf | ||||||
|
|
ICBT group | –2.13 (–3.39 to –0.86), <.001 | N/A | –2.63 (–3.99 to –1.26), <.001 | N/A | .02 |
|
|
ICBT group vs CBGT group | N/A | –1.29 (–2.83 to 0.26), .135 | N/A | –0.75 (–2.45 to 0.95), .851 | N/A |
|
|
ICBT group vs TAU group | N/A | –2.46 (–3.93 to –0.98), <.001 | N/A | –2.53 (–4.16 to –0.90), .001 | N/A |
|
|
CBGT group | –1.36 (–2.71 to –0.01), <.001 | N/A | –2.39 (–3.85 to –0.93), <.001 | N/A | N/A |
|
|
CBGT group vs TAU group | N/A | –1.17 (–2.70 to 0.36), .198 | N/A | –1.78 (–3.47 to –0.10), .04 | N/A |
|
|
TAU group | –0.09 (–1.34 to 1.16), .99 | N/A | –0.52 (–1.86 to 0.83), .99 | N/A | N/A |
aYBOCS: Yale-Brown Obsessive-Compulsive Scale.
bICBT: internet-based cognitive behavioral therapy.
cN/A: not applicable.
dCBGT: cognitive behavioral group therapy
eTAU: treatment as usual.
fFOCI: Florida Obsessive-Compulsive Inventory.