Table 3.
Difference of score in outcomes, P value, and effect size.
| Outcome and evaluation point | ICBTa group, mean change (SD) | Control, mean change (SD) | F test (df=2, 66; ANCOVAb) | P value (ANCOVA) | Effect size (Hedge g) | ||||
| LSASc | |||||||||
|
|
Baseline to postintervention assessment | 16.90 (22.63) | 4.16 (17.38) | 3.91 | .02 | 0.64 | |||
|
|
Preintervention to postintervention assessment | 14.90 (14.86) | N/Ad | 4.65 | .01 | 0.66 | |||
| SPINe | |||||||||
|
|
Baseline to postintervention assessment | 10.87 (11.40) | 2.87 (8.69) | 5.39 | .007 | 0.80 | |||
|
|
Preintervention to postintervention assessment | 11.19 (9.33) | N/A | 7.23 | .01 | 0.93 | |||
| PHQ-9f | |||||||||
|
|
Baseline to postintervention assessment | 0.68 (3.36) | –0.32 (2.85) | 1.19 | .31 | 0.22 | |||
|
|
Preintervention to postintervention assessment | 1.42 (2.98) | N/A | 2.96 | .06 | 0.49 | |||
| GAD-7g | |||||||||
|
|
Baseline to postintervention assessment | 0.29 (2.98) | –1.03 (3.17) | 1.61 | .21 | 0.09 | |||
|
|
Preintervention to postintervention assessment | 0.97 (2.83) | N/A | 4.15 | .02 | 0.32 | |||
| EQ-5D-5L | |||||||||
|
|
Baseline to postintervention assessment | –0.0299 (0.09) | 0.0079 (0.09) | 1.61 | .21 | 0.003 | |||
|
|
Preintervention to postintervention assessment | –0.0301 (0.11) | N/A | 1.41 | .25 | 0.0004 | |||
aICBT: internet-based cognitive behavioral therapy.
bANCOVA: analysis of covariance.
cLSAS: Liebowitz Social Anxiety Scale.
dN/A: not applicable.
eSPIN: Social Phobia Inventory.
fPHQ-9: Patient Health Questionnaire-9.
gGAD-7: Generalized Anxiety Disorder-7.