Table 4 Subgroup analysis for the incidence of overall complications
| Â | No. studies | Samples | OR | 95% CI | P value | I2 |
|---|---|---|---|---|---|---|
Measurement method | ||||||
 SMI | 3 | 380 | 1.29 | 0.82–2.03 | 0.27 | 0% |
 PMI | 3 | 1483 | 1.34 | 0.62–2.87 | 0.45 | 75% |
Region of studies | ||||||
 Asia | 3 | 587 | 1.10 | 0.66–1.86 | 0.71 | 43% |
 Non-Asia | 3 | 1276 | 1.49 | 0.69–3.23 | 0.31 | 86% |