Table 1.
Patient characteristics according to COVID-19 status
| Pre-pandemic period | Pandemic period | Group differences | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| All causes (n = 10,173) | Other causes (n = 11,019) | COVID-19 wave 1 (n = 349) | COVID-19 wave 2 (n = 1103) | χ2 | P | |||||
| n | % | n | % | n | % | n | % | |||
| Age on admission (yr) | ||||||||||
| 18–39 | 1205 | 11.8 | 1188 | 10.8 | 22 | 6.3 | 101 | 9.2 | 87 | < 0.001 |
| 40–59 | 1989 | 19.6 | 2292 | 20.8 | 86 | 24.6 | 331 | 30.0 | ||
| 60–79 | 3342 | 32.9 | 3708 | 33.7 | 119 | 34.1 | 350 | 31.7 | ||
| ≥ 80 | 3637 | 35.8 | 3831 | 34.8 | 122 | 35.0 | 321 | 29.1 | ||
| Sex | ||||||||||
| Men | 4854 | 47.7 | 5229 | 47.5 | 201 | 57.6 | 649 | 58.8 | 66 | < 0.001 |
| Women | 5319 | 52.3 | 5790 | 52.5 | 148 | 42.4 | 454 | 41.2 | ||
| LACE index ≥ 10 | 38.8 | 39.4 | 61.3 | 50.3 | 123 | < 0.001 | ||||
| ICD code | ||||||||||
| U07.1 | – | – | – | – | 349 | 100 | 961 | 87.1 | 50 | < 0.001 |
| U07.2 | – | – | – | – | 0 | 0 | 142 | 12.9† | ||
| Mortality | ||||||||||
| In hospital | 772 | 7.6 | 862 | 6.0 | 114 | 32.7 | 242 | 21.9 | 648 | < 0.001 |
| Within 30 days of discharge | 436 | 4.6 | 419 | 4.0 | 14 | 6.0 | 18 | 2.1 | 16.1 | 0.005 |
| Readmissions | ||||||||||
| Single readmission | 936 | 9.2 | 853 | 7.7 | 32 | 9.2 | 105 | 9.5 | 20.0 | 0.003 |
| ≥ 2 readmissions | 299 | 2.9 | 281 | 2.6 | 9 | 2.6 | 29 | 2.6 | ||
Admission, sex and mortality data as % of column totals
*ICD code: diagnosed on the basis of positive anti-COVID antibodies (ICD code U07.1) and clinical presentation (ICD code U07.2). †Including four patients with diagnosis based on history (one (U07.3 and three U07.4)