Fig. 4: This figure presents a heatmap illustrating the percentage of digital mental health apps within each mental health condition category that incorporate specific PSD principles.
From: A meta-analysis of persuasive design, engagement, and efficacy in 92 RCTs of mental health apps
To reduce heterogeneity, only interventions targeting a single mental health condition with more than one intervention per condition were included, resulting in the analysis of 61 apps. Each cell shows the percentage of apps within the specific mental health category that incorporated a given PSD principle. Colour intensity reflects prevalence, with red tones indicating higher usage and green tones indicating lower usage.
