Shahidi 2011.

Methods	RCT
Participants	Older members of a local cultural community Age 60 ‐ 80 100% women all with geriatric depression score greater than 10 (n = 70)
Interventions	1. 10 sessions of aerobic group exercise, each 30 minutes in duration, including jogging and stretching (n = 23) 2 "Laughter yoga" ‐ 10 sessions of structured group activity which includes laughing, clapping, chanting and positive discussion (n = 23) 3. Control (n = 24)
Outcomes	Depression scoring on Geriatric Depression Scale, Life Satisfaction scale
Notes	Overall drop‐out of 10 participants
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	No detail given
Allocation concealment (selection bias)	Unclear risk	No detail given
Blinding (performance bias and detection bias) participants	Unclear risk	Participants not blinded to intervention; unclear what effect this may have on bias
Blinding (performance bias and detection bias) those delivering intervention	Unclear risk	Not blinded; unclear effect on bias
Blinding (performance bias and detection bias) outcome assessors	High risk	Geriatric depression scale; self‐reported
Incomplete outcome data (attrition bias) All outcomes	High risk	14% attrition rate
Selective reporting (reporting bias)	Low risk	All measures listed at outset reported in results
Other bias	Unclear risk	Unclear