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Errors in Data Analysis.

Errors in Data Analysis: In the Research Letter entitled “Pain at 12 Months After Surgery for Breast Cancer”1 published in the January 1, 2014, issue of JAMA, an error in the original analysis led to the psychological factors (Beck Depression Inventory and Spielberger State and Trait Anxiety Questionnaires) being derived from the 12-month questionnaires rather than from preoperatively acquired scores. Reanalysis for a different project resulted in changes in Tables 1 and 2, including mean values (Table 1) and Spearman correlations (Table 2) for the BDI and State and Trait anxiety sum scores, as well as odds ratios, CIs, and P values (Table 2). The factors predicting persistent pain in the multivariable analysis remained otherwise the same, but at the end of the Results section in the text, “preoperative depression” was replaced by “preoperative trait anxiety.” The conclusions of the study were not affected. This article was corrected online.