Summary of findings for the main comparison. Overview of studies.

Interventions for health improvement in all populations
Outcomes	Intervention and Comparison intervention	Illustrative comparative risks* (95% CI)		Relative effect (95% CI)	No of Participants (studies)	Comments
		Assumed risk	Corresponding risk
		With comparator	With intervention
Mortality
	Mortality/health improvement	Study population		RR 1.04 (0.92 to 1.17)	1994 (3)
		347 per 1000	352 per 1000
Mental Health
	Morbidity/health improvement		The mean mental health score in the intervention groups was 0.28 standard deviations lower, a small effect favouring intervention (95% CI: 0.52 to 0.04 lower).		12060 (5)	Standard Mean Difference ‐0.28 (‐0.52 to ‐0.04)
Physical Health
	Morbidity/health improvement		The mean physical health score in the intervention groups was 0.01 standard deviations lower (95% CI: 0.1 lower to 0.07 higher).		11388 (5)	Standard Mean Difference ‐0.01 (‐0.1 to 0.07)
Quality of Life
	Morbidity/health improvement		The mean quality of life in the intervention groups was 0.08 standard deviations lower (95% CI 0.44 lower to 0.27 higher).		797 (3)	Standard Mean Difference ‐0.08 (‐0.44 to 0.27)
Global Assessment of Function symptoms score
	Morbidity/health improvement		The mean global assessment of function symptoms score in the intervention groups was 2.63 lower, a small effect favouring intervention (95% CI: 5.16 to 0.1 lower).		600 (2)