“…Treatment duration ranged from 10 days to 4 months. Most of the studies (26/38, 68%) used mental health apps with CBT [ 31 , 45 - 48 , 50 , 51 , 53 , 55 - 62 , 66 - 68 , 72 - 75 , 77 - 79 ], 32% (12/38) used mindfulness [ 49 , 52 , 57 , 63 - 67 , 69 - 71 , 74 , 76 , 82 ], 8% (3/38) used ACT [ 62 , 73 , 82 ], 8% (3/38) did not have a therapy associated with the app, and only 5% (2/38) used BA [ 54 , 70 ]. In terms of the depressive symptom outcome measures, 32% (12/38) of the studies used the PHQ-9, 26% (10/38) used the BDI-II, 16% (6/38) used the DASS-21, 11% (4/38) used the CES-D, 3% (1/38) used the HADS, 3% (1/38) used the IDS-SR, 3% (1/38) used the CCAPS-34, and 3% (1/38) used the PROMIS.…”