A Prospective, Randomized Trial Comparing Hydromorphone and Nalbuphine for Postcesarean Patient-Controlled Analgesia and Developing a Risk Prediction Model for Inadequate Analgesia.

Although surgical history did not reach statistical significance (OR = 2.10, 95% CI: 0.82–5.32, P = 0.121), the relatively high odds ratio suggests a potential association that may warrant further investigation.

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