Participants’ evaluation of the SIC (cross-sectional study)
illness
When asked to review the format and content of the SIC, all participants perceived the SIC to be straightforward, comprehensive, and easy to use, even when they were moderately ill. Several participants indicated that self-report on the SIC would be challenging during severe illness or intubation, although measures could be (or were) taken with assistance from a caregiver or using fingers to indicate symptom severity. Overall, participants felt the SIC was an accurate measure to report and track COVID-19 symptom onset, emergence of new signs/symptoms, and changes in symptoms over time.