نبذة مختصرة : Background Internet-based interventions (IBIs) are a low-threshold treatment for individuals with depression. However, comparisons of IBI against unstandardized care-as-usual (CAU) are scarce. Moreover, little evidence is available if IBI has an add-on effect for individuals already receiving an evidence-based treatment such as antidepressants and/or psychotherapy. Method This parallel, two-arm RCT (1:1 allocation ratio, simple randomization) examines the effectiveness of a therapist-guided cognitive-behavioral IBI compared to unstandardized CAU in a self-selected sample of adults (≥ 18 years). Eligible individuals reported (a) mild (BDI-II score ≥ 14) to moderately severe (PHQ-9 ≤ 19) symptoms of depression, (b) no acute suicidal ideations, (c) no acute or lifetime (hypo-)mania and/or symptoms of psychosis. We assigned eligible individuals to an intervention (INT) arm or an unstandardized CAU-arm (i.e., we imposed no restrictions on what individuals were allowed to do in the 8-week waiting period). Individuals in the INT-arm got access to a 7-module CBT-based IBI. The primary endpoint is depressive symptom load 9 to 11 weeks after randomization. Secondary endpoints included anxiety, self-efficacy, and perceived social support. We report effects for the entire sample ( N = 1899), as well as for individuals using the IBI as a stand-alone intervention ( n = 1408) or as an add-on to antidepressants ( n = 367), psychotherapy ( n = 73), or antidepressants and psychotherapy ( n = 51). Patients entered the trial with these concurrent treatments (i.e., they were not randomly assigned). Results Concerning all randomized individuals, 62.5% of individuals in the INT-arm accessed all treatment modules within 11 weeks. Individuals assigned to the INT-arm reported significantly lower depressive symptoms (PHQ-9: − 2.5, 95% CI [− 2.9, − 2.0], d = − 0.7; BDI-II: − 5.3, 95% CI [− 6.5, − 4.1], d = − 0.8) and higher rates of ≥ 50% symptom improvements (PHQ-9: 38.5% vs. 14.3%; BDI-II: 44.6% vs. 14.8%) compared to individuals ...
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