• Yang Wang, Zejun Liu, Shuanghong Chen, Xiaoxuan Ye, Wenyi Xie, Chunrong Hu, Tony Iezzi, and Todd Jackson.
• Key Laboratory of Cognition and Personality, Southwest University, Chongqing, China.
• Pain Med. 2018 Nov 1; 19 (11): 2283-2295.

ObjectiveAcute postsurgical pain is common and has potentially negative long-term consequences for patients. In this study, we evaluated effects of presurgery sociodemographics, pain experiences, psychological influences, and surgery-related variables on acute postsurgical pain using logistic regression vs classification tree analysis (CTA).DesignThe study design was prospective.SettingThis study was carried out at Chongqing No. 9 hospital, Chongqing, China.SubjectsPatients (175 women, 84 men) completed a self-report battery 24 hours before surgery (T1) and pain intensity ratings 48-72 hours after surgery (T2).ResultsAn initial logistic regression analysis identified pain self-efficacy as the only presurgery predictor of postoperative pain intensity. Subsequently, a classification tree analysis (CTA) indicated that lower vs higher acute postoperative pain intensity levels were predicted not only by pain self-efficacy but also by its interaction with disease onset, pain catastrophizing, and body mass index. CTA results were replicated within a revised logistic regression model.ConclusionsTogether, these findings underscored the potential utility of CTA as a means of identifying patient subgroups with higher and lower risk for severe acute postoperative pain based on interacting characteristics.

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