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| Variables | Morphine | p value | ||
|---|---|---|---|---|
| (–) | (+) | |||
| Persistent pain (+) | No. (%) | 7 (58.3) | 50 (26.9) | 0.0416 |
| Total | No. | 12 | 186 | |
| Dose of intrathecal Bupivacaine (ug/kg) | Mean (SD) | 199 (32) | 195 (26) | 0.442 |
| Fentanyl (ng/mL) | Mean (SD) | 166 (27) | 162 (22) | 0.442 |
| Morphine (ng/mL) | Mean (SD) | 0 | 1624 (216) | <0.0001 |
