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This study analyses the psychometric properties of the Working Alliance Inventory adapted for guided Internet interventions (WAII).

We drew on the data set from a multicenter trial that examined a guided Internet intervention (deprexis) for patients with mild to moderate depression. Two hundred twentythree patients completed the WAII and the Patient Satisfaction Questionnaire (ZUF8) at posttreatment, and the Attitudes toward Psychological OnlineInterventions Questionnaire (APOI) at baseline. We ran confirmatory factor analyses (CFA) testing two and threefactor solutions and calculated Cronbach's α, itemtotal correlations, and correlations of the WAII with APOI and ZUF8.

The results suggested a twofactor solution, with a very good model fit and evidence of factor independency, adequate internal consistency, and external validity for the complete scale and the subscales …