Characteristics of study participants (A) and distribution of potential confounding factors (B).

aGeometric mean.Unless otherwise indicated, the median with a 95% CI is given for severe and uncomplicated cases for day 0 (left) and day 28 (right). P values for variables shown in part (A) are derived from the random effects linear regression model. Part (B) shows z-scores compared using Mann-Whitney test, and proportions for qualitative variables not included in the model, compared using Chi-square test.