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Updated: Jun 3, 2026

Measuring Psoriasis Severity at Home
Published on: March 1, 2024
Incidence of arthritis in a prospective cohort of psoriasis patients
Lihi Eder1, Vinod Chandran, Hua Shen
1University of Toronto Psoriatic Arthritis Clinic, Centre for Prognosis Studies in the Rheumatic Diseases 1E-410B, Toronto Western Hospital, 399 Bathurst Street, Toronto, Ontario, Canada M5T 2S8.
Objective:
Epidemiologic studies about the incidence of psoriatic arthritis (PsA) are limited to a few population-based studies. There are limited data regarding the incidence of PsA in patients with psoriasis. We aimed to determine the incidence of PsA among a prospective cohort of psoriasis patients.
Methods:
The setting is a prospective longitudinal cohort study of psoriasis patients without arthritis. The patients are assessed annually by a rheumatologist in order to detect the onset of arthritis. We summarize the results of 4 years of followup and report the cumulative incidence of PsA from the time of entry to the study that was estimated using an event per person-years analysis and a nonparametric analysis.
Results:
Three hundred thirteen psoriasis patients that had at least 1 year of followup were included in the analysis. The annual incidence rate was found to be 1.87 (95% confidence interval 0.71-3.03) PsA cases per 100 psoriasis patients.
Conclusion:
The incidence rate of PsA in patients with psoriasis may be higher than previously reported, particularly among patients with moderate to severe psoriasis.
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