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. 2023 May 24;25:e41283. doi: 10.2196/41283

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.