Longitudinal validation of the Maudsley 3-item visual analogue scale (M3VAS): a new, brief, patient-reported outcome measure of depression

Following previous cross-sectional validation against the Quick Inventory of Depressive Symptomatology-Self-report, this present study demonstrated appropriate longitudinal measurement properties for M3VAS as a measure of depression, including responsiveness. Evaluating the ability of M3VAS to discern responses with a variety of treatments is a key future goal.