2.5. Analysis.

Comparison 2: Acceptance and commitment therapy (ACT), Outcome 5: Mental health outcomes

Mental health outcomes
Study	Depression	Anxiety	Quality of life	Stress	Negative affect	Other
Gifford 2003	Not assessed	Not assessed	Not assessed	Not assessed	Profile of Mood States (POMS): assessed at each follow‐up. No difference across conditions at post‐treatment (F (1.83) = 0.688, P = 0.409), 6 months (F (1.82) = 0.438, P = 0.510), or 12 months (F (1.65) = 0.080, P = 0.779)	Not assessed
O'Connor 2020	Not assessed	Not assessed	Not assessed	Not assessed	Not assessed	Positive mental health ‐ Mental Health Continuum ‐ Short Form (MHC‐SF): assessed at post‐treatment and 6 months. No significant difference across conditions at post‐treatment (ACT face‐to‐face vs behavioural support: P = 0.491; ACT face‐to‐face + app vs ACT face‐to‐face: P = 0.865) or 6 months (ACT face‐to‐face vs behavioural support: P = 0.457; ACT face‐to‐face + app vs ACT face‐to‐face: P = 0.990)