Table 2.
Results of subgroup analyses
| Overall results | Studies, N | OR (95% CI) | p value | I 2 (%) |
|---|---|---|---|---|
| 10 | 1.08 (1.02–1.15) | 0.006 | 70.9 | |
| Study design | ||||
| Prospective studies | 4 | 1.18 (0.88–1.57) | 0.270 | 77 |
| Randomized controlled trials | 1 | 1.11 (1.02–1.20) | 0.012 | NA |
| Retrospective studies | 5 | 1.03 (1.00–1.06) | 0.062 | 71.4 |
| Country | ||||
| Japan | 1 | 1.16 (0.73–1.85) | 0.533 | NA |
| Italy | 3 | 1.10 (0.97–1.24) | 0.125 | 79.6 |
| America | 4 | 1.39 (0.85–2.26) | 0.186 | 70.7 |
| Korea | 2 | 1.16 (0.86–1.57) | 0.342 | 80.6 |
| Ischemia time | ||||
| 10–15 min | 3 | 2.80 (2.72–2.88) | < 0.001 | 52.9 |
| 25–45 min | 5 | 2.78 (2.74–2.82) | < 0.001 | 65.4 |
Note: CI, confidence interval, OR, Odds Ratio; NA, not available