Development and validation of a new instrument to measure health-related quality of life in patients with psoriatic arthritis: the VITACORA-19.

Objective: To develop/validate an instrument to measure health-related quality of life (HRQoL) in patients with psoriatic arthritis (PsA), for use in clinical studies.

Methods: An item pool of 35 items was generated following standardized procedures. Item reduction was performed using clinimetric and psychometric approaches after administration to 66 patients with PsA.