Statistical Analyses
At the prevalence study (asymptomatic cohort) design stage, it was estimated that the asymptomatic prevalence of SARS-Co-V-2 would likely range between 15 and 20% (17). The sensitivity of current RT-PCR assays for SARS-CoV-2 has not been published but was expected to range from 70-90%. Specificity was expected to be above 90%. Therefore, to adequately power a study with a 10% prevalence rate would require between 355 and 574 patients, while if prevalence was found to be 20% this study would require between 462 and 733 patients. Median and interquartile range (IQR) are calculated for continuous variables, while counts and percentages are used to describe categorical variables. The Clopper-Pearson interval was used to find a 95% confidence interval for the probability of having positive seroprevalence results.