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| Relative Risk (95% CI) | P value | |
|---|---|---|
| Agent: Lidocaine vs. Bupivacaine | 6.18 (4.7-7.9) | 0.003 |
| Needle: Quincke vs. Sprotte | 1.39 (0.7-1.8) | 0.7 |
| Position: Lithotomy vs. Supine | 4.1 (3.0-4.9) | 0.008 |
| Duration of surgery: less than one hour vs. more than one hour | 1.63 (1.1-2.3) | 0.04 |
