This retrospective observational cohort study analyzed previously collected longitudinal data from users of the Kintsugi Voice Journaling app. Participants voluntarily recorded voice samples through the app and completed standardized self-report measures of depression and anxiety, including the Patient Health Questionnaire-9 (PHQ-9) and Generalized Anxiety Disorder-7 (GAD-7), over a period of several years.
The study population included individuals who used the Kintsugi Voice Journaling app and contributed voice recordings and mental health questionnaire data. No intervention was assigned as part of this study, and no additional data were collected specifically for the research analysis.
The analysis evaluated associations between features derived from participants' voice recordings and self-reported symptoms of depression and anxiety. The study was conducted using previously collected observational data from approximately 50,000 participants.
