Comparison 6. Sensitivity analysis on differences in control groups between studies (placebo, common care, no antibiotics).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Sensitivity analysis on differences in control groups between studies	11	1109	Risk Ratio (IV, Random, 95% CI)	0.55 [0.36, 0.84]
1.1 Studies that used a placebo in the control group	5	520	Risk Ratio (IV, Random, 95% CI)	0.44 [0.24, 0.81]
1.2 Studies that applied common care in the control group	3	333	Risk Ratio (IV, Random, 95% CI)	0.66 [0.31, 1.37]
1.3 Studies that used neither placebo nor antibiotics in the control group	2	212	Risk Ratio (IV, Random, 95% CI)	0.61 [0.07, 5.53]
1.4 Studies that used disinfectant in the control group	1	44	Risk Ratio (IV, Random, 95% CI)	0.21 [0.03, 1.72]