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| Variable | Placebo (n = 65), No. (%) | Meperidine (n = 65), No. (%) | Fentanyl (n = 65), No. (%) | Total (n = 195), No. (%) | P value |
|---|---|---|---|---|---|
| Age, y | |||||
| < 30 | 31 (47.7) | 41 (63.1) | 44 (67.7) | 116 (59.5) | 0.052 |
| ≥ 31 | 34 (52.3) | 24 (36.9) | 21 (32.3) | 79 (40.5) | 0.052 |
| Mean ± SD | 32.16 ± 7.31 | 28.64 ± 6.14 | 27.73 ± 6.01 | 29.51 ± 6.76 | 0.0001 |
| Weight, kg, Mean ± SD | 85.1 ± 12.19 | 77.95 ± 9.56 | 81.69 ± 8.82 | 81.58 ± 10.85 | 0.0001 |
