TABLE 1.
Baseline characteristics of the study cohort on age, sex, BMI, smoking, alcohol use, education level, and place of work stratified by seropositivity among 20,267 unvaccinated participantsb
| Characteristic | Data for patients who were: |
P value | ||
|---|---|---|---|---|
| Seronegative | Seropositive | Total | ||
| No. of patients | 18,410 | 1,857 | 20,267 | |
| Female (no. [%]) | 15,342 (84.4) | 1,496 (81.4) | 16,838 (84.1) | 0.002 |
| Male (no. [%]) | 2,828 (15.6) | 341 (18.6) | 3,169 (15.8) | |
| Age (median [IQR]) | 44.4 [32.8, 53.7] | 43.9 [31.6, 52.7] | 44.3 [32.7, 53.6] | 0.024 |
| Body mass index (median [IQR]) | 25.3 [22.6, 29.1] | 25.3 [22.8, 29.4] | 25.3 [22.7, 29.1] | 0.155 |
| Ever smoker (no. [%]) | 3,595 (19.5) | 279 (15.0) | 3,874 (19.1) | <0.001 |
| Ever use of alcohol (no. [%])a | 15,322 (83.7) | 1,656 (80.6) | 16,978 (83.8) | 0.004 |
| Previously positive PCR test (no. [%]) | 736 (4.3) | 1,066 (61.1) | 1802 (8.9) | <0.001 |
| Education (no. [%]) | 0.005 | |||
| No formal education | 191 (1.0) | 15 (0.8) | 206 (1.0) | |
| Primary education | 663 (3.6) | 63 (3.4) | 726 (3.6) | |
| Secondary education (youth education) | 1,889 (10.3) | 233 (12.7) | 2,122 (10.5) | |
| Vocational training or short-/medium-term higher education | 13,316 (72.7) | 1,329 (72.3) | 14,645 (72.7) | |
| Long-term higher education | 2,078 (11.4) | 191 (10.4) | 2,269 (11.3) | |
| Place of work in Denmark | <0.001 | |||
| Capital region of Denmark | 5,152 (28.2) | 713 (38.6) | 5,865 (29.1) | |
| Region Zealand | 2,178 (11.9) | 248 (13.4) | 2,426 (12.0) | |
| Southern Denmark | 3,588 (19.6) | 286 (15.5) | 3,874 (19.2) | |
| Central Denmark | 5,769 (31.5) | 474 (25.7) | 6,243 (31.0) | |
| Northern region of Denmark | 1,614 (8.8) | 126 (6.8) | 1.740 (8.6) | |
a
Alcohol use, reporting 7 units of alcohol a week for females or 14 units of alcohol for male.
b
Missing values are excluded from analysis.