Table 3.
Subgroup analysis for recurrence.
| Subgroup | No. of studies | OR | Lower 95% CI | Upper 95% CI | I 2 | P for I2 |
|---|---|---|---|---|---|---|
| Study location | ||||||
| United States | 1 | 0.626 | 0.161 | 2.432 | — | — |
| China | 4 | 1.629 | 0.461 | 5.748 | 40.7% | 0.167 |
| Korea | 1 | — | — | — | — | — |
| Stage of RCC | ||||||
| T1a | 4 | 0.918 | 0.376 | 2.237 | 0% | 0.749 |
| T1b | 1 | 0.693 | 0.107 | 4.505 | — | — |
| T1a/T1b | 1 | 23.959 | 1.364 | 420.711 | — | — |
| Ablation approach | ||||||
| Percutaneous or laparoscopic | 3 | 0.831 | 0.338 | 2.038 | 0% | 0.743 |
| Laparoscopic | 2 | 1.059 | 0.173 | 6.499 | — | — |
| Percutaneous | 1 | 23.959 | 1.364 | 420.711 | — | — |
| Ablation navigation | ||||||
| CT | 1 | 0.626 | 0.161 | 2.432 | — | — |
| US | 5 | 1.629 | 0.461 | 5.748 | 40.7% | 0.167 |
| Surgical approach | ||||||
| Open or laparoscopic | 4 | 1.363 | 0.374 | 4.976 | 51.6% | 0.102 |
| Laparoscopic | 1 | 1.059 | 0.173 | 6.499 | — | — |
| Open | 1 | — | — | — | — | — |
| Average age | ||||||
| ≤60 | 3 | 0.877 | 0.315 | 2.439 | 0% | 0.459 |
| >60 | 3 | 2.006 | 0.279 | 14.412 | 61.1% | 0.077 |
| R.E.N.A.L. nephrometry score | ||||||
| Available | 3 | 2.118 | 0.341 | 13.162 | 59% | 0.087 |
| Not reported | 4 | 0.756 | 0.255 | 2.241 | 0 | 0.65 |
OR, odds ratio; CI, confidence interval; RCC, renal cell carcinoma; CT, computed tomography; US, ultrasound. R.E.N.A.L., radius, exophytic/endophytic, nearness of tumor to collecting system, anterior/posterior, hilar tumor touching main renal artery or vein and location relative to polar lines.