Table 3 Subgroup analysis for the incidence of major complications

Measurement method

 SMI

12

2951

1.13

0.84–1.53

0.40

47%

 PMI

6

1926

1.86

0.77–4.51

0.17

89%

Region of studies

 Asia

13

3359

1.30

0.86–1.97

0.21

76%

 Non-Asia

5

1518

1.39

0.68–2.82

0.37

79%

Definition of cut-off values

 ROC curves

5

1223

2.73

1.35–5.53

0.005

69%

 Lowest quantile

7

2178

0.92

0.59–1.45

0.73

66%

 Martin’s definition

2

355

1.70

0.58–5.02

0.33

74%

 Prado’s definition

4

1121

1.00

0.69–1.45

1.00

19%