5 Strengths and limitations
There are some strengths in this study. First of all, we selected four measures of sarcopenia, including ASM, LH, RH and WP, to explore the association of sarcopenia and COVID-19 in this study. Additionally, to eliminate the impact of BMI on the association of WP and COVID-19, we used WP adjusted for BMI to analyze the relationship between WP and COVID-19. However, the GWAS data used in this study all originated from European ancestry, thus it exists a racial heterogeneity and cannot be extrapolated to other races. Furthermore, because the GWAS data was not available, we only adjusted for WP by BMI, but not by other factors, such as age, resulting in limited interpretation of the results.