Table 3. Characteristics of patients identified by different combinations of the International Statistical Classification of Diseases and Related Health Problems 10th Revision (ICD-10) diagnosis codes, for case definitions 1 to 6, Denmark, week 1 2022–week 52 2023 (n = 6 case definitions).
| Characteristics | Case definition | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CD1 | CD2 | CD3 | CD4 | CD5 | CD6 | |||||||
| Total | 113,313 | 5,207 | 9,588 | 20,353 | 75 | 12,787 | ||||||
| Age group (years) | n | % | n | % | n | % | n | % | n | % | n | % |
| 0–4 | 4,048 | 3.6 | 3,900 | 74.9 | 4,448 | 46.4 | 0 | 0.0 | 1 | 1.3 | 779 | 6.1 |
| 5–14 | 1,012 | 0.9 | 107 | 2.1 | 910 | 9.5 | 1 | 0.0 | 0 | 0.0 | 377 | 2.9 |
| 15–29 | 4,080 | 3.6 | 37 | 0.7 | 1,605 | 16.7 | 3 | 0.0 | 7 | 9.3 | 806 | 6.3 |
| 30–64 | 22,619 | 20.0 | 295 | 5.7 | 1,617 | 16.9 | 3,711 | 18.2 | 33 | 44.0 | 4,091 | 32.0 |
| 65–79 | 39,892 | 35.2 | 464 | 8.9 | 649 | 6.8 | 10,515 | 51.7 | 25 | 33.3 | 4,545 | 35.5 |
| ≥80 | 41,662 | 36.8 | 404 | 7.8 | 359 | 3.7 | 6,123 | 30.1 | 9 | 12.0 | 2,189 | 17.1 |
| Length of stay (days) | Median | IQR | Median | (IQR) | Days (n) | Median (IQR) | Days (n) | Median (IQR) | Days (n) | Median (IQR) | Days (n) | Median (IQR) |
| Overall | 4.1 | 2.1–7.2 | 1.9 | 1.0–3.9 | 1.1 | 0.7–2.2 | 3.6 | 1.9–6.1 | 20.2 | 8.9–36.0 | 3.1 | 1.0–9.3 |
| Intensive care treatment | n | % | n | % | n | % | n | % | n | % | n | % |
| Patients receiving ICT | 10,520 | 9.3 | 778 | 14.9 | 1,114 | 11.6 | 4,009 | 19.7 | 65 | 86.7 | 7,315 | 57.2 |
| Mortality | n | % | n | % | n | % | n | % | n | % | n | % |
| All mortality | 13,100 | 11.6 | 77 | 1.5 | 75 | 0.8 | 2,033 | 10.0 | 29 | 38.7 | 2,552 | 20.0 |
| In-hospital mortality | 7,667 | 6.8 | 30 | 0.6 | 43 | 0.4 | 1,193 | 5.9 | 26 | 34.7 | 2,089 | 16.3 |
| SARS-CoV-2 | n | % | n | % | n | % | n | % | n | % | n | % |
| Tested | 93,227 | 82.3 | 3,702 | 71.1 | 5,268 | 54.9 | 16,014 | 78.7 | 46 | 61.3 | 5,718 | 44.7 |
|
Positive
(n and % of tested) |
30,001 | 32.2 | 77 | 2.1 | 265 | 5.0 | 373 | 2.3 | 2 | 4.3 | 194 | 3.4 |
| Influenza virus | n | % | n | % | n | % | n | % | n | % | n | % |
| Tested | 79,275 | 70.0 | 3,935 | 75.6 | 4,966 | 51.8 | 14,521 | 71.3 | 40 | 53.3 | 4,424 | 34.6 |
|
Positive
(n and % of tested) |
7,429 | 9.4 | 19 | 0.5 | 127 | 2.6 | 174 | 1.2 | 1 | 2.5 | 39 | 0.9 |
| RSV | n | % | n | % | n | % | n | % | n | % | n | % |
| Tested | 40,771 | 36.0 | 3,784 | 72.7 | 3,838 | 40.0 | 6,976 | 34.3 | 22 | 29.3 | 2,161 | 16.9 |
|
Positive,
(n and % of tested) |
2,156 | 5.3 | 1,828 | 48.3 | 415 | 10.8 | 337 | 4.8 | 0 | 0.0 | 181 | 8.4 |
CD: case definition; ICT: intensive care treatment; IQR: interquartile range, RSV: respiratory syncytial virus.