APPENDIX A1.

Frequencies for missing data

Variable	N present	N missing	% missing
Days COVID-19 test sample to admission	2031	0	0.0
Mortality	2031	0	0.0
Province	2031	0	0.0
Sex	2030	1	0.0
Age	2029	2	0.1
Days symptom onset to admission	1743	288	14.2
Days symptom onset to COVID-19 test sample	1743	288	14.2
ICU	1647	384	18.9
Mechanical ventilation	1643	388	19.1
LOS	1640	391	19.3
Housing	1633	398	19.6
Antibiotics or anti-virals	1625	406	20.0
Direct acting antiviral or immunie modulatory medications	1622	409	20.1
Clinical Frailty Scale	1602	429	21.1
Cardiovascular	1584	447	22.0
At least one comorbidity	1583	448	22.1
Respiratory	1583	448	22.1
Immunosuppressed	1583	448	22.1
Immunocompromised	1583	448	22.1
Goals of care	1571	460	22.6
Travel history	1463	568	28.0
Ethnicitya	1419	612	30.1
Occupation	1346	685	33.7
Known direct exposure	810	1221	60.1

^aResearch Ethics Board regulations did not allow collection of ethnicity data at some sites.