Area under the receiver operating characteristic (ROC) curve for (A) postoperative complications and (B) nursing home placement in models including traditional covariates plus high-sensitivity C-reactive protein (CRP) and with either frailty or Mobility Assessment Tool–short form (MAT-sf) scores. Traditional covariates included age, sex, body mass index, pain score, Revised Cardiac Risk Index, American Society of Anesthesiologists physical status classification, and surgical risk.