Comparison 4. Above‐knee externally supported graft versus unsupported graft materials.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Primary patency at 6 months	2	299	Peto Odds Ratio (Peto, Fixed, 95% CI)	1.28 [0.71, 2.31]
1.1 Externally supported dacron versus unsupported dacron	1	253	Peto Odds Ratio (Peto, Fixed, 95% CI)	1.29 [0.69, 2.39]
1.2 Externally supported PTFE versus unsupported PTFE	1	46	Peto Odds Ratio (Peto, Fixed, 95% CI)	1.21 [0.16, 9.25]
2 Primary patency at 12 months	2	286	Peto Odds Ratio (Peto, Fixed, 95% CI)	1.78 [1.06, 2.98]
2.1 Externally supported dacron versus unsupported dacron	1	246	Peto Odds Ratio (Peto, Fixed, 95% CI)	1.71 [0.99, 2.93]
2.2 Externally supported PTFE versus unsupported PTFE	1	40	Peto Odds Ratio (Peto, Fixed, 95% CI)	2.73 [0.49, 15.28]
3 Primary patency at 24 months	2	270	Peto Odds Ratio (Peto, Fixed, 95% CI)	2.08 [1.29, 3.35]
3.1 Externally supported dacron versus unsupported dacron	1	240	Peto Odds Ratio (Peto, Fixed, 95% CI)	2.09 [1.26, 3.46]
3.2 Externally supported PTFE versus unsupported PTFE	1	30	Peto Odds Ratio (Peto, Fixed, 95% CI)	2.01 [0.46, 8.76]
4 Secondary patency at 6 months	1		Peto Odds Ratio (Peto, Fixed, 95% CI)	Totals not selected
5 Secondary patency at 12 months	1		Peto Odds Ratio (Peto, Fixed, 95% CI)	Totals not selected
6 Secondary patency at 24 months	1		Peto Odds Ratio (Peto, Fixed, 95% CI)	Totals not selected