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Prevalence and Clinical Characteristics of Patients with Moderate-to-Severe Asthma in Japan Using a JMDC Claims Database.

INTRODUCTION: Although the prevalence and burden of asthma are continuously increasing, there is a lack of evidence on the landscape of moderate-to-severe asthma in Japan. Here, we report the prevalence of moderate-to-severe asthma and describe patient's demographics and clinical characteristics from 2010 to 2019 using the JMDC claims database.

METHODS: Patients (≥12 years) from the JMDC database with ≥2 asthma diagnoses in 2 different months in each index year were stratified as moderate-to-severe asthma based on the definition of asthma prevention and management guideline (Japanese Guidelines for Asthma, JGL) or Global Initiative for Asthma (GINA).

PRIMARY OBJECTIVE: 10-year trend (2010-2019) in the prevalence of moderate-to-severe asthma.

SECONDARY OBJECTIVE: Demographics and clinical characteristics of patients from 2010 to 2019.

RESULTS: Of 7,493,027 patients from the JMDC database, 38,089 and 133,557 were included in JGL and GINA cohorts, respectively, by 2019. Both cohorts presented an increasing trend in the prevalence rate of moderate-to-severe asthma from 2010 to 2019, irrespective of age groups. Demographics and clinical characteristics were consistent across the cohorts in each calendar year. Majority of patients were in the age group of 18-60 years in both JGL (86.6%) and GINA (84.2%) cohorts. Allergic rhinitis was the most frequent comorbidity and anaphylaxis the least frequent comorbidity reported in both the cohorts.

CONCLUSIONS: In Japan, the prevalence rate of patients with moderate-to-severe asthma, as per JGL or GINA in the JMDC database, increased from 2010 to 2019. The demographics and clinical characteristics were similar in both cohorts over the assessment duration.

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