Figure 3:

Flowchart of hospital admissions for COVID-19 attributed to first-ever SARS-CoV-2 infection. We used the British Columbia COVID-19 Cohort. All data were extracted on Aug. 24, 2023. Where step-specific tallies of U07.1- and U07.3-coded hospital admissions do not sum to the displayed total, it is because both diagnostic codes were specified. In addition, but not displayed here, of 1346 deaths identified within the vital statistics database since Jan. 1, 2020, among Lower Mainland residents with underlying cause specified as U07.1 (none specified as U07.3) during the span of intersurvey periods, we excluded 59 (4.4%) with a SARS-CoV-2 NAAT-positive test 90 days or more before date of death. Fewer than 1% of hospital admissions identified provincially were missing information to assign health authority to the Lower Mainland. We did not exclude any hospital admissions or deaths on the basis of missing age or date of admission or death. We did not exclude any hospital admissions on the basis of missing sex, and excluded fewer than 10 fatalities on this basis, handled as indicated in Appendix 1, Supplementary Material 1. Note: FHA = Fraser Health Authority, NAAT = nucleic acid amplification test, VCHA = Vancouver Coastal Health Authority.