Table 2 Results of sensitivity analyses.

	No. of trials	Combined relative risks (95% CI)
		Initial hemostasis	Definitive hemostasis	Rebleeding	Need for surgery	Mortality
Clips versus injections
All trials	8	1.01 (0.96 to 1.06)	1.14 (1.00 to 1.30)	0.49 (0.30 to 0.79)	0.37 (0.15 to 0.90)	1.45 (0.44 to 4.74)
Study duration
Shorter (< 4 weeks)	4	0.99 (0.92 to 1.05)	1.07 (0.87 to 1.32)	0.59 (0.29 to 1.20)	0.39 (0.12 to 1.27)	1.64 (0.22 to 12.2)
Longer ( 4 weeks)	3	1.04 (0.97 to 1.11)	1.23 (0.97 to 1.56)	0.38 (0.18 to 0.80)	0.34 (0.09 to 1.35)	1.35 (0.31 to 5.89)
Adjuvant proton pump inhibitors
Yes	2	1.00 (0.91 to 1.10)	1.07 (0.94 to 1.21)	0.59 (0.23 to 1.54)	0.97 (0.06 to 14.8)	2.97 (0.48 to 18.3)
No	6	1.01 (0.96 to 1.07)	1.21 (0.98 to 1.49)	0.46 (0.26 to 0.81)	0.33 (0.12 to 0.86)	0.68 (0.12 to 3.95)
Quality
High (> 3)	3	0.99 (0.85 to 1.15)	1.14 (0.75 to 1.74)	0.62 (0.32 to 1.21)	0.36 (0.09 to 1.46)	0.51 (0.05 to 5.43)
Low ( 3)	5	1.03 (0.97 to 1.10)	1.17 (1.06 to 1.29)	0.39 (0.19 to 0.78)	0.37 (0.11 to 1.20)	2.18 (0.50 to 9.53)
Clips with injection versus injections
All trials	7	1.00 (0.95 to 1.05)	1.13 (1.03 to 1.23)	0.47 (0.28 to 0.76)	0.23 (0.08 to 0.70)	1.23 (0.45 to 3.37)
Study duration
Shorter (< 4 weeks)	4	0.97 (0.83 to 1.13)	1.11 (0.96 to 1.28)	0.54 (0.22 to 1.36)	0.31 (0.07 to 1.32)	0.81 (0.10 to 6.33)
Longer ( 4 weeks)	3	1.06 (0.97 to 1.16)	1.20 (1.07 to 1.35)	0.30 (0.11 to 0.78)	0.09 (0.01 to 1.63)	1.68 (0.23 to 12.5)
Adjuvant Proton pump inhibitors
Yes	4	0.98 (0.82 to 1.18)	1.15 (1.03 to 1.29)	0.31 (0.16 to 0.63)	0.28 (0.07 to 1.02)	0.70 (0.19 to 2.64)
No	3	1.00 (0.93 to 1.07)	1.09 (0.94 to 1.25)	0.80 (0.39 to 1.64)	0.16 (0.02 to 1.29)	3.07 (0.05 to 18.7)
Quality
High (> 3)	3	0.97 (0.87 to 1.09)	1.08 (0.85 to 1.37)	0.45 (0.22 to 0.93)	0.27 (0.05 to 1.35)	2.87 (0.59 to 14.1)
Low ( 3)	4	1.04 (0.96 to 1.13)	1.15 (1.03 to 1.29)	0.48 (0.24 to 0.94)	0.21 (0.05 to 0.94)	0.53 (0.12 to 2.39)