(A) Measurement models for symptoms of centralized pain in UCPPS, mixed pain (MP), and healthy controls (HC). Model fit for UCPPS: Χ2 =20.512, df= 13, p =.0832. RMSEA = .037, 90% CI = .000, .066. CFI = .991. SRMR = .027; Model fit for MP: Χ2 =18.014, df= 13, p =.1570. RMSEA = .044, 90% CI = .000, .088. CFI = .991. SRMR = .027;; Model fit for HC: Χ2 =8.007, df= 13, p =.8431. RMSEA = .000, 90% CI = .000, .028. CFI = 1.000. SRMR = .023. Standardized loadings are shown. (B) Mean symptom levels by group with standard errors.