Incidence and prevalence of juvenile systemic lupus erythematosus in Korea: data from the national health claims database 2017.

The purpose of the present study was to investigate the prevalence and incidence of JSLE in Korea.The data were collected from the National Health Insurance Claims Database of Korea. JSLE was identified using the diagnostic code M32 from the Korean Standard Classification of Diseases. Patients between 5 and 18 years old, who had at least one claim for JSLE from January 1, 2016, to December 31, 2017, as final diagnosis, were analyzed in the study. For prevalent cases, patients who used, at least one time, any type of medical services as a diagnostic code of M32 were selected. For incident cases, patients who did not use medical services during prior 1 year as M32 code and newly registered in 2017 were defined. Statistical analysis was used to find the age at which changes in prevalence and incidence occurred, that is, change-point.The prevalence of JSLE was 5.35 per 100,000 persons and the incidence of JSLE was 2.20 per 100,000 person-year in patients between 5 and 18 years old. The prevalence and incidence of JSLE were higher in females than in males. According to the change- point analysis, we found that the incidence and prevalence of female patients increased rapidly at the ages of 14 and 15, respectively.This Korean population-based epidemiological study of JSLE showed similar epidemiologic profiles to Asian population in other studies. The distribution of age, ethnicity, and pubertal status are important factors that influence population estimates of JSLE incidence and prevalence.

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