Shiff NJ, et al. - Researchers evaluated the juvenile idiopathic arthritis (JIA) incidence and prevalence for children <16 years of age in the province of Manitoba, Canada, and tested for changes in estimates between 2000 and 2012. They ascertained the JIA cases from Manitoba's administrative health data using a validated case-finding algorithm. Experts found that for JIA only a few population-based longitudinal epidemiologic studies have been conducted. Results suggested the overall prevalence of JIA and the incidence and prevalence for males to decrease.