Comparison 8. Co‐interventions, continuous.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
8.1 Main analysis	4	522	Std. Mean Difference (IV, Random, 95% CI)	Not estimable
8.1.1 Clinical	4	522	Std. Mean Difference (IV, Random, 95% CI)	Not estimable
8.1.2 Preclinical	0	0	Std. Mean Difference (IV, Random, 95% CI)	Not estimable
8.2 Not in meta‐analysis	19		Other data	No numeric data
8.2.1 Insufficient data	4		Other data	No numeric data
8.2.2 No relevant data	15		Other data	No numeric data