Table 1

Baseline characteristics of patients hospitalised for COVID-19 during the first 10 weeks of 2022 (Omicron era) and for seasonal influenza, the 10-week peak of 2009/2010 (H1N1 pandemic), 2015/2016 (higher severity in children) and 2016/2017 (higher severity in adults), British Columbia, Canada

CharacteristicsCOVID-19 (n=2561)Influenza 2009/2010 (n=1395)Influenza 2015/2016 (n=655)Influenza 2016/2017 (n=1443)
n (%)n (%)n (%)n (%)
Sex
 Female1012 (40)750 (54)322 (49)774 (54)
 Male1549 (60)645 (46)333 (51)669 (46)
 P valueRef<0.0001<0.0001<0.0001
Age, years, Median (Q1–Q3)71 (58–82)39 (15–55)56 (26–72)77 (62–87)
 P valueRef<0.0001<0.0001<0.0001
Age groups, years
 0–4127 (5)188 (13)81 (12)53 (4)
 5–1130 (1)132 (9)44 (7)12 (1)
 12–1714 (1)62 (4)18 (3)19 (1)
 18–2949 (2)191 (14)29 (4)24 (2)
 30–3980 (3)136 (10)52 (8)51 (4)
 40–49135 (5)208 (15)50 (8)51 (4)
 50–59262 (10)226 (16)88 (13)111 (8)
 60–69484 (19)114 (8)102 (16)184 (13)
 70+1380 (54)138 (10)191 (29)938 (65)
 P valueRef<0.0001<0.0001<0.0001
Health authority
 Fraser974 (38)450 (32)156 (24)338 (23)
 Vancouver Coastal521 (20)257 (18)194 (30)443 (31)
 Vancouver Island290 (11)195 (14)157 (24)450 (31)
 Interior549 (21)341 (24)92 (14)168 (12)
 Northern198 (8)138 (10)46 (7)29 (2)
 Unknown29 (1)14 (1)10 (2)15 (1)
 P valueRef0.0002<0.0001<0.0001
Number of comorbidities
 0–1588 (23)642 (46)234 (36)214 (15)
 2–3588 (23)329 (24)150 (23)269 (19)
 4+1385 (54)424 (30)271 (41)960 (67)
 P valueRef<0.0001<0.0001<0.0001
Vaccine status
 Unvaccinated965 (38)NANANA
 Vaccinated, 1 dose103 (4)NANANA
 Vaccinated, 2+ doses1493 (58)NANANA
  • For the peak COVID-19 cohort, we included all patients hospitalised for COVID-19 during the first 10 weeks of 2022 when Omicron was dominant and >90% of adults in British Columbia were vaccinated with at least two doses. For influenza peak analysis, we selected data-driven 10-week peak from each season during which the majority of all hospitalised cases of the year were admitted.

  • NA, not applicable; Q, quartile; Ref, reference.