Each patient underwent articular and skin assessment.Ĭonstruct validity: Factor analysis revealed a 2-factor result defined as the PsAID Symptom Score and the PsAID Skin Score. In 144 consecutive patients with PsA (81 men and 63 women, mean age of 51.4 ± 12.8 yrs, and 77 receiving biologic treatment), the PsAID-12 and other patient-reported outcomes (PRO) were collected, such as the Dermatology Life Quality Index. To study, in a real-life setting, the construct validity, the reliability, and the interpretability of the 12-item Psoriatic Arthritis Impact of Disease (PsAID-12) questionnaire in patients with psoriatic arthritis (PsA). Salaffi, MD, PhD, Rheumatology Department, Polytechnic University of Marche. Favalli, MD, Rheumatology Department, Istituto Ortopedico Gaetano Pini F. Crotti, MD, Clinical and Community Sciences Department, University of Milan E.G. Lato, MD, Rheumatology Department, Polytechnic University of Marche C. Becciolini, MD, Rheumatology Department, Istituto Ortopedico Gaetano Pini V. Di Carlo, MD, Rheumatology Department, Polytechnic University of Marche A. 3 From the Rheumatology Department, Polytechnic University of Marche, Jesi Rheumatology Department, Istituto Ortopedico Gaetano Pini, Milan Clinical and Community Sciences Department, University of Milan, Milan, Italy. 1 From the Rheumatology Department, Polytechnic University of Marche, Jesi Rheumatology Department, Istituto Ortopedico Gaetano Pini, Milan Clinical and Community Sciences Department, University of Milan, Milan, Italy.

Psa reliability and validity