Depression Four reviews42 44 57 58 presented analyses by weekly session duration (68 component RCTs, >5016 participants, online supplemental eFigure 12). The median SMD for ≤150 min/week and >150 min/week was –0.58 (IQR=–0.77 to –0.30) and –0.29 (IQR=–0.40 to –0.07), respectively.

Anxiety One review58 provided analyses by weekly session duration (17 component RCTs, online supplemental eFigure 13). The median SMDs for <150 min/week and ≥150 min/week were –1.23 and –0.99, respectively.