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OBJECTIVE Rasch item response theory analysis is essential in evaluating measurement tools in specific disease cohorts. We compared the performance of 4 functional indexes in patients with psoriatic arthritis (PsA) in axial or peripheral disease subgroups. METHODS A cross-sectional study was performed in a single center. Functional outcomes assessed by(More)
OBJECTIVE The construct validity of the patient global health assessment (PGA) in psoriatic arthritis (PsA) has not been analyzed, despite its common use. We evaluated the construct validity of a numeric rating scale (NRS) of the PGA in PsA. METHODS Patients with PsA who fulfilled the ClASsification for Psoriatic ARthritis (CASPAR) criteria were recruited(More)
BACKGROUND Psoriatic arthritis (PsA) disease activities at baseline may determine physical function over time. There is no longitudinal data on course of physical function in PsA patients from Asia. We aim to describe variables associated with a deterioration of physical function in PsA in Chinese over a 6-year period. METHODS 125 consecutive patients(More)
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