Vaccination, regular exercise, and prevention of chronic lung disease reduce exacerbation of COVID-19 severity in northern Okinawa, Japan: A cross-sectional study.

"Declarations Ethics approval and consent to participateThis study was approved by the institutional review board of Okinawa North Medical Association Hospital. We obtained written and online consent from the participants to use their anonymized personal data for research. Consent for publicationNot applicable. Availability of data and materialThe data analyzed in this study are not publicly available. Competing interestsThe authors declare that they have no competing interests. FundingNot applicable. Authors’ contributionsTK: Conceptualization, Resources, Data analysis, Writing – original draft. DT: Conceptualization, Resources. YN: Conceptualization, Reviewing. YH: Resources. MS: Resources. RT: Resources. AY: Resources. TM: Resources. HS: Supervision. AcknowledgmentsWe would like to thank Nurses Junko Shibayama, Noriko Kishimoto, Akinori Tamaki, and Yasuko Oshiro from the COVID-19 Task Force at Okinawa North Medical Association Hospital for managing the data. We deeply appreciate Drs. Yoshihisa Nakamura, Tomoko Oshiro, Miwa Churiki, and Yasuko Kishimoto for their support in conducting the health checkups. We would like to express our sincere gratitude to Dr. Hitoshi Oshiro (DATA MILL LLC, Yonago, Japan) for valuable suggestions regarding statistical analyses. Competing interests The authors declare that they have no competing interests."

"Funding Not applicable."