Trends in the Prevalence and Incidence of Psoriasis and Psoriatic Arthritis in Ontario, Canada: A Population‐Based Study

Objective To estimate the prevalence and incidence of psoriasis and psoriatic arthritis (PsA) over time in Ontario, Canada. Methods We performed a population‐based study of Ontario health administrative data, using validated case definitions for psoriasis and PsA. We computed the crude and age‐ and sex‐standardized cumulative prevalence and incidence of psoriasis from 2000 to 2015. Results Among the 10,774,802 individuals ages ≥20 years residing...