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Although the efficacy of Internet‐ and mobile‐based interventions (IMIs) for anxiety is established, little is known about the intervention components responsible for therapeutic change. We conducted the first comprehensive meta‐analytic review of intervention components of IMIs for adult anxiety disorders.

Randomized controlled trials (RCTs) comparing IMIs for anxiety disorders to active online control groups, or IMIs to dismantled variations of the same intervention (± specific components) were identified by a systematic literature search in six databases. Outcomes were validated observer‐rated or self‐report measures for anxiety symptom severity and treatment adherence (number of completed modules and completer rate). This meta‐analytic review is registered with PROSPERO (CRD42017068268).

We extracted the data of 34 RCTs (with 3,724 participants) and rated the risk of …