Coronavirus disease 2019 (COVID-19) is an infectious disease caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Currently, there is no cure for COVID-19, except for supportive treatments. Quarantine for a defined period is the best option to reduce the spread of COVID-19. Physical activity has been shown to reduce the risk of serious community-acquired infections. However, it remains unanswered is whether physical activity has protective effects against SARS-CoV-2 infection and COVID-19 related mortality. This study aimed to examine the association of PA with the morbidity and mortality of COVID-19 infection in the entire South Korean population.

Inclusion Criteria:

• all Koreans who tested positive for SARS-CoV-2
• more than 18 years old
• who underwent public health screening between 2014 and 2017

Exclusion Criteria:

• missing values about physical activity

The Korean nationwide COVID-19 study was a retrospective, nationwide study including all Koreans who tested positive for SARS-CoV-2, aimed at evaluating the characteristics and outcomes of patients with COVID-19. Case patients were defined as individuals over 18 years old with positive results for the SARS-CoV-2 test. For every case patient, we selected up to 20 random controls from the target population who underwent the national health screening.

The present study are not publicly accessible due to Korean personal information projection act.