Statistics and models to predict shedding
T-tests with equal variances and chi-squared tests were used to compare continuous and categorical demographic and symptom severity variables. Fisher’s exact tests were used to compare binomial proportions between experimental and natural cases for fine and coarse shedding subjects and samples. Welsh’s t-test for unequal variance and the Wilcoxon rank sum test were used to compare GM and median aerosol shedding, respectively. Tests were two-tailed. Unadjusted effects on risk and rate of fine aerosol shedding were estimated for symptom scores, observed cough count, age, and sex. Analysis of shedding risk used all exhaled breath observations. Analysis of shedding quantity used the same predictors refined to the maximum shedding day per shedder.