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Patient characteristics (n = 30, mean ± SD)
| Butorphanol group | Meperidine group | P value | |
| Age (yr) | 37.70 ± 10.76 | 38.90 ± 10.89 | 0.669 |
| Sex (%) | 0.778 | ||
| Male | 20 (66.7) | 22 (73.3) | |
| Female | 10 (33.3) | 8 (26.7) | |
| Weight (kg) | 62.70 ± 10.29 | 64.83 ± 12.01 | 0.463 |
| Height (cm) | 164.57 ± 7.03 | 165.73 ± 7.18 | 0.528 |
