Table 1. Characteristics of the PCR positive (PCR+) and PCR negative (PCR-) participants at the first antibody test (T1).
| Characteristics | Total (N = 1094) | PCR+ (N = 391) | PCR-(N = 703) |
|---|---|---|---|
| N (%) | N (%) | N (%) | |
| Age in years, mean (SD) | 47.5 (14.6) | 47.9 (15.0) | 47.3 (14.3) |
| N (range) | 1094 (19–98) | 391 (20–85) | 703 (19–98) |
| BMI in kg/m 2 , median (IQR) | 25.6 (23.2–29.1) | 25.6 (23.2–28.7) | 25.6 (23.3–29.3) |
| N (range) | 1057 (15.7–65.6) | 374 (15.7–42.8) | 683 (15.7–65.5) |
| BMI in kg/m2 ≥ 25 | 598 (54.7) | 206 (55.1) | 392 (57.4) |
| Gender, males | 435 (39.8) | 196 (50.1) | 239 (34.0) |
| Income | |||
| <500 000 NOKa | 216 (19.7) | 68 (17.4) | 148 (21.1) |
| 500 000–1 000 000 NOK | 474 (43.3) | 162 (41.4) | 312 (44.4) |
| ≥ 1 000 000 NOK | 365 (33.4) | 137 (35.0) | 228 (32.4) |
| Education | |||
| Primary & secondary school | 116 (10.6) | 40 (10.2) | 76 (10.8) |
| High school & certificate | 362 (33.1) | 146 (37.3) | 216 (30.7) |
| University less than 4 years | 342 (31.3) | 128 (32.7) | 214 (30.4) |
| University > 4 years | 255 (23.3) | 66 (16.9) | 189 (26.9) |
| Smoking | |||
| Non-smoker | 527 (56.0) | 213 (61.5) | 314 (52.8) |
| Past smoker | 302 (32.1) | 103 (29.8) | 199 (33.4) |
| Occasional and daily smoker | 112 (11.9) | 30 (8.7) | 82 (13.8) |
| Comorbidity | |||
| Asthma | 195 (17.8) | 61 (15.6) | 134 (19.1) |
| COPD | 34 (3.1) | 7 (1.8) | 27 (3.8) |
| Other chronic lung disease | 44 (4.0) | 16 (4.1) | 28 (4.0) |
| Cancer | 37 (3.4) | 7 (1.8) | 30 (4.3) |
| Heart disease | 48 (4.4) | 16 (4.1) | 32 (4.6) |
| Diabetes | 47 (4.3) | 20 (5.1) | 27 (3.8) |
| Hypertension | 110 (10.1) | 39 (10.0) | 71 (10.1) |
| Musculoskeletal disease | 63 (5.8) | 17 (4.3) | 46 (6.5) |
| Any other disease | 194 (17.7) | 55 (14.1) | 139 (19.8) |
| No disease | 554 (50.6) | 211 (54.0) | 343 (48.8) |
| Pollen allergy | 298 (27.2) | 96 (24.6) | 202 (28.7) |
| Symptoms | |||
| Cough | 511 (46.7) | 181 (46.3) | 330 (46.9) |
| Running nose | 470 (43) | 124 (31.7) | 346 (49.2) |
| Stuffy nose | 416 (38.0) | 123 (31.5) | 293 (41.7) |
| Sore throat | 531 (48.5) | 161 (41.2) | 370 (52.6) |
| Pain in swallowing | 239 (21.8) | 53 (13.6) | 186 (26.5) |
| Dyspnoea | 417 (38.1) | 296 (50.1) | 221 (31.4) |
| Headache | 565 (51.6) | 250 (63.9) | 315 (44.8) |
| Fever | 503 (46.0) | 254 (65.0) | 249 (35.4) |
| Fever with chills or sweating | 311 (28.4) | 163 (41.7) | 148 (21.1) |
| Abdominal pain, nausea or diarrhoea | 250 (22.9) | 117 (29.9) | 133 (18.9) |
| Impaired sense of smell or taste | 360 (32.9) | 260 (66.5) | 100 (14.2) |
| Myalgia | 459 (42.0) | 227 (58.1) | 232 (33.0) |
| Dizziness | 318 (29.1) | 167 (42.7) | 151 (21.5) |
| Fatigue, moderate and serious b | 132 (12.1) | 104 (26.6) | 28 (4.0) |
a One NOK = 0.096 Euro
b Fatigue categories:1 = no, 2 = light, 3 = moderate, 4 = serious
SD: Standard deviation
IQR: Interquartile range