showed a trendp = 0.049
Compared with the reference group under 35 years of age, people aged 51–65 years ( β = 0.31, 95% CI [0.17, 0.44], p < 0.001) and 66 years and older ( β = 0.50, 95% CI [0.37, 0.64], p < 0.001) had significantly more severe COVID-19, while the group 36–50 years showed a trend toward more severe disease ( β = 0.13, p = 0.049).