Measurement model in the UCPPS cohort at baseline, 6 months and one year (n = 332). Model fit for baseline: Χ2 =37.378, df= 19, p =.0071. RMSEA = .054, 90% CI = .027, .079. CFI = .974. SRMR = .038; Model fit for month 6: Χ2 =27.039, df= 19, p =.1038. RMSEA = .036, 90% CI = .000, .064. CFI = .990. SRMR = .029; Model fit for year one: Χ2 =35.551, df= 19, p =.0120. RMSEA = .051, 90% CI = .024, .077. CFI = .981. SRMR = .032.