Table 2 Results of subgroup and sensitivity analyses

Results of orthopaedic surgery surgery

1.70 (0.95–3.04), 26%

N/A^a

N/A

Results of cardiac surgery

2.00(1.23–3.26), 0%

N/A

N/A

Results of noncardiac surgery

1.37(1.17–1.61), 67%

1.25(0.76–2.04), 66%

1.23(0.82–1.85), 34%

Results of vascular surgery

1.51(1.02–2.23), 82%

1.18(0.88–1.60), 0%

1.46(0.92–2.31), 0%

Results of RCTs^b

2.01(1.07–3.77), 68%

N/A

N/A

Results of prospective observational studies

1.35(1.11–1.66), 26%

1.07(0.90–1.27), 0%

1.06(0.88–1.28), 0%

Results of retrospective observational studies

1.29(0.99–1.69), 73%

1.42(0.22–9.24), 85%

1.87(0.35–10.06), 85%