Table 2.

Rubber dam versus cotton rolls

Survival rate	No. of studies	No. of participants	Statistical method	Effect size
6 months	20,21		Odds ratio (IV, fixed, 95% CI)	2.29 [1.05, 4.99]
12 months	20		Odds ratio (IV, fixed, 95% CI)	1.38 [0.45, 4.28]
18 months	20		Odds ratio (IV, fixed, 95% CI)	1.00 [0.45, 2.25]
24 months	19	559	Hazard ratio (IV, fixed, 95% CI)	0.80 [0.66, 0.97]
Chair time	20		Mean difference (IV, fixed, 95% CI)	-0.40 [-2.26, 1.46]