Composite Measures of Disease Activity in Psoriatic Arthritis: Comparative Instrument Performance Based on the Efficacy of Guselkumab in an Interventional Phase II Trial

Objective To assess performance of psoriatic arthritis (PsA) composite indices and evaluate guselkumab’s effect on achieving low disease activity or remission. Methods In this phase II trial, patients with active PsA (≥3 tender and ≥3 swollen joints, C‐reactive protein level ≥0.3 mg/dl, ≥3% body surface‐area with psoriasis involvement) were randomized 2:1 to subcutaneous guselkumab 100 mg (n = 100) or placebo (n = 49) at week 0, week 4, and every 8 weeks through week 44. At week 16, patients with