Using an influenza epidemic threshold different from those in the United States and Europe caused longer epidemic periods in Korea during the 2018–2019, 2019–2020, and 2022–2023 seasons: a comparative study

Dataset 1. Research data used to draw Fig. 1, which shows seasonal influenza activity during the 2018−2019 season in Korea according to different influenza epidemic thresholds in Korea, the United States, and Europe. Dataset 2. Research data used to draw Fig. 2, which shows seasonal influenza activity during the 2019−2020 season in Korea according to different influenza epidemic thresholds in Korea, the United States, and Europe. Dataset 3. Research data used to draw Fig. 3, which shows seasonal influenza activity during the 2022−2023 season in Korea according to different influenza epidemic thresholds in Korea, the United States, and Europe.