Prevalence of Coats disease.

PurposeTo determine the prevalence and incidence of Coats disease in the Japan Medical Data Center (JMDC) claims database.MethodsData on patients with Coats disease were collected from the JMDC claims database that were collected over a five-year period between 2019–2023. The patients with were grouped by their sex and age. The prevalence and incidence were then calculated relative to all of the members in the JMDC database. The treatment rate was calculated as the ratio of patients receiving retinal photocoagulation or vitrectomy to the total number of patients over the five-year period.ResultsThe age-adjusted prevalence of Coats disease in the JMDC database was 1.7/100,000 with 2.4 males to 0.9 females for the five-year period. The age-adjusted prevalence in children ConclusionThis is the first study that determined the prevalence and incidence of Coats disease in the JMDC database. The prevalence and incidence in children were approximately double that of adults. The proportion of females was higher among adults than among children.