A Self-Guided Internet-Based Intervention for the Reduction of Gambling Symptoms: A Randomized Clinical Trial.

Importance: Most individuals with problem gambling or gambling disorder remain untreated due to barriers to treatment. Limited research exists on alternative treatments.

Objective: To investigate the efficacy of a self-guided internet-based intervention for individuals with gambling problems and to identify potential outcome moderators.

A randomized controlled trial on COGITO, a free self-help smartphone app to enhance mental well-being.

Background: Smartphone apps may help to prevent the transition from minor to severe mental health problems. We compared a free self-help smartphone app (COGITO; www.uke.