TABLE 1.
Baseline characteristics of the study cohort on sex, age, BMI, smoking, alcohol use, previous test result, and comorbidities stratified by seropositivitya
| Full cohort | Seronegative | Seropositive | P |
|---|---|---|---|
| n | 316,033 | 2,519 | |
| Age (yrs) (median [IQR]) | 53 [39-64]) | 55 [42-64] | 0.041 |
| Male (%) | 113,412 (422) | 1,012 (40.2) | <0.001 |
| Body mass index (median [IQR]) | 25.4 [22.8, 28.7] | 25.5 [23, 29] | 0.115 |
| Ever smoker (%) | 168,024 (53.2) | 1,375 (54.6) | 0.161 |
| Alcohol use (%) | 36,747 (12.9) | 302 (13.5) | 0.443 |
| Comorbidities (%) | |||
| Myocardial infarction | 6562 (2.1) | 59 (2.3) | 0.389 |
| Stroke | 9067 (2.9) | 91 (3.6) | 0.030 |
| Hypertension | 82215 (26.0) | 711 (28.2) | 0.013 |
| Diabetes | 17528 (5.5) | 165 (6.6) | 0.032 |
| Cancer | 23250 (7.4) | 185 (7.3) | 1.000 |
| Rheumatoid arthritis | 19309 (6.1) | 176 (7.0) | 0.074 |
| COPD | 13872 (4.4) | 150 (6.0) | <0.001 |
| Asthma | 43996 (13.9) | 375 (14.9) | 0.172 |
| Other chronic disease | 56134 (17.8) | 456 (18.1) | 0.675 |
| Work type | |||
| Not working | 123,959 (39.2) | 947 (37.6) | |
| Office work | 83,401 (43.4) | 538 (34.2) | |
| Tradesman | 20,653 (10.8) | 154 (9.8) | |
| School/other education | 23,773 (12.4) | 199 (12.7) | |
| Shop work | 9,103 (4.7) | 78 (5.0) | |
| Nursing home | 5,768 (3.0) | 57 (3.6) | |
| Healthcare sector | 21,863 (11.4) | 287 (18.3) | |
| Home care | 3,827 (2.0) | 52 (3.3.) | |
| Other | 44,755 (23.3) | 370 (23.5) | |
| Exposed to SARS-CoV-2 infected person | |||
| Yes | 32,099 (10.2) | 713 (28.3) | |
| No | 212,966 (67.4) | 1,208 (48.0) | |
| Do not know | 70,968 (22.5) | 598 (23.7) | <0.001 |
aAlcohol use: Reporting >7 units of alcohol a week for females or >14 units of alcohol for male. The cohort enncompasses students, stay-at-home persons, out of job, long-term sick leave, retired, and persons on parental leave. Occupations are counted as the percentage of seropositive among those working. Each participant can have more than one type of occupation; thus, the percentage sums up to more than 100.