Classification of acute pain trajectory after breast cancer surgery identifies patients at risk for persistent pain: a prospective observational study.

In the acute pain at 1 day after the surgery model, the adjusted odds ratios for the severe and moderate pain groups were similar (3.26 and 2.40 for the severe and moderate pain groups, respectively; P =0.063 and P =0.062 for the severe and moderate pain groups, respectively) and did not reach statistical significance compared with the no/mild pain group.

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