Table 3. Characteristics of participants according to COVID-19 severity based on PCR testing only.
| Variable | COVID-19* | |||
|---|---|---|---|---|
| Total, n | Mild (n, %) |
Severe (n, %) |
||
| N | 4,114 | 4,046 (100.0%) | 68 (100.0%) | |
| Sex | Female | 3,279 | 3,236 (80.0%) | 43 (63.2%) |
| Male | 835 | 810 (20.0%) | 25 (36.8%) | |
| Age | <30 years | 865 | 860 (21.3%) | 5 (7.4%) |
| 30–50 years | 1,947 | 1,928 (47.7%) | 19 (27.9%) | |
| >50 years | 1,302 | 1,258 (31.1%) | 44 (64.7%) | |
| BMI (kg/m 2 )** | < 25 or missing*** | 2,286 | 2,260 (55.9%) | 26 (38.2%) |
| 25–30 | 1,193 | 1,168 (28.9%) | 25 (36.8%) | |
| > 30 | 635 | 618 (15.3%) | 17 (25.0%) | |
| Smoking | Missing | 107 | 107 (2.6%) | 0 |
| Non-smoker | 3,267 | 3,209 (79.3%) | 58 (85.3%) | |
| Smoker or former smoker | 740 | 730 (18.0%) | 10 (14.7%) | |
| Alcohol intake | 0 or missing*** | 1,737 | 1,714 (42.4%) | 23 (33.8%) |
| 1–7 | 1,966 | 1,939 (47.9%) | 27 (39.7%) | |
| ≥8 | 411 | 393 (9.7%) | 18 (26.5%) | |
| Educational level | None, short or missing*** | 674 | 664 (16.4%) | 10 (14.7%) |
| Middle | 2,473 | 2,434 (60.2%) | 39 (57.4%) | |
| Long | 967 | 948 (23.4%) | 19 (27.9%) | |
| Patient contact | Missing | 6 | 6 (0.1%) | 0 |
| No | 415 | 407 (10.1%) | 8 (11.8%) | |
| Yes–partly | 711 | 694 (17.2%) | 17 (25.0%) | |
| Yes | 2,982 | 2,939 (72.6%) | 43 (63.2%) | |
| Region | Missing | 0 | 0 | 0 |
| Capital | 3,320 | 3,261 (80.6%) | 59 (86.8%) | |
| Zealand | 794 | 785 (19.4%) | 9 (13.2%) | |
| Asthma | No | 3800 | 3,746 (92.6%) | 54 (79.4%) |
| Yes | 314 | 300 (7.4%) | 14 (20.6%) | |
| Hypertension | No | 3,840 | 3,785 (93.5%) | 55 (80.9%) |
| Yes | 274 | 261 (6.5%) | 13 (19.1%) | |
| Other Chronic Disease**** | No | 3,842 | 3,782 (93.5%) | 60 (88.2%) |
| Yes | 272 | 264 (6.5%) | 8 (11.8%) | |
| Any Chronic Disease | No | 3,193 | 3,161 (78.1%) | 32 (47.1%) |
| Yes | 921 | 885 (21.9%) | 36 (52.9%) | |
* COVID-19 cases based on PCR testing only. Severe COVID-19 was defined as any hospital admission for more than 48 hours with time of admission within 14 days after a positive SARS-CoV-2 PCR test.
**According to BMI categories as defined by the World Health Organization.
*** As there were between 1–4 missing, groups were merged to allow display of data according to Statistics Denmark’s guidelines.
****’Other Chronic Disease’ includes ’Weakened Immune System’, ’Kidney Disease’, ’Heart Disease’, ’Lunge Disease Other Than Asthma’ and ’Diabetes’
Abbreviations: BMI, body mass index. SARS-CoV-2, Severe Acute Respiratory Syndrome Coronavirus-2. PCR, polymerase chain reaction.