Ce score B Age Gender Ethnicity Marital status Occupation Presence of chronic medical illness Perceived dangerous PSI value The actual PSI value at the time of survey Personal possession of N-95 mask Perceived usefulness of N-95 mask Total number of physical symptomsIES-R = Impact of Event Scale - Revised.Mean intrusion score SE RMean hyper-arousal score SE RTotal mean IES-R score SE RTotal IES-R