TABLE 1.
Participant demographics by screening step
| Online survey | Screening visit | Adequate antibodies | Fully qualified | |
|---|---|---|---|---|
| No. (%) | 3093 | 521 | 307 (58.9) | 209 (40.1) |
| Age, median (IQR), y | 47 (35‐57) | 47 (35‐56) | 50 (39‐58) | 49 (36‐57) |
| <40 years old, no. (%) | 1009 (32.6) | 177 (34.0) | 85 (27.7) | 67 (32.1) |
| 40‐60 years old, no. (%) | 1521 (49.2) | 271 (52.0) | 169 (55.5) | 11 (53.1) |
| >60 years old, no. (%) | 467 (15.1) | 73 (14.0) | 53 (17.6) | 31 (14.8) |
| Not reported, no. (%) | 96 (3.1) | ‐ | ‐ | ‐ |
| Sex | ||||
| Male, no. (%) | 1165 (37.7) | 307 (58.9) | 196 (63.8) | 151 (72.3) |
| Female, no. (%) | 1913 (61.9) | 214 (41.1) | 111 (36.2) | 58 (27.8) |
| Not reported, no. (%) | 15 (0.5%) | ‐ | ‐ | ‐ |
| Weight, median (IQR), kg | 170 (145‐200) | 185 (155‐210) | 191 (165‐218) | 199 (170‐222) |
| Survey self‐reported COVID‐19 diagnosis method | ||||
| Positive PCR test reported, no. (%) | 1667 (53.9) | 446 (85.6) | 283 (92.2) | 194 (92.8) |
| Clinical diagnosis by health care provider, no. (%) | 326 (10.5) | 62 (11.9) | 17 (5.5) | 11 (5.63 |
| None, no. (%) | 1095 (35.4) | 12 (2.3) | 6 (2.0) | 4 (1.9) |
| Not reported, no. (%) | 5 (0.2) | 1 (0.2) | 1 (0.33) | ‐ |
| Symptom onset to first Ab test, median (IQR), days | ‐ | 38 (32–44) | 37 (33‐43) | 38 (33‐44) |
| Symptom duration, median (IQR), days | 15 (11‐21) | 12 (7‐17) | 13 (8‐16) | 12 (7‐16) |
| Total symptoms reported | 5 (3‐6) | 5 (3‐6) | 5 (3‐6) | 5 (3‐6) |
| Symptoms | ||||
| Fever | ‐ | 387 (74.3) | 249 (81.1) | 166 (79.4) |
| Myalgias | ‐ | 248 (47.6) | 164 (53.4) | 111 (53.1) |
| Unproductive cough | ‐ | 256 (49.1) | 153 (49.8) | 103 (49.3) |
| Fatigue | ‐ | 243 (46.6) | 149 (48.5) | 100 (47.9) |
| Headache | ‐ | 209 (40.1) | 132 (43.0) | 92 (44.0) |
| Loss of taste or smell | ‐ | 215 (41.3) | 122 (39.7) | 84 (40.2) |
| Shortness of breath | ‐ | 148 (28.4) | 87 (28.3) | 63 (30.1) |
| Gastrointestinal symptoms a | ‐ | 131 (25.1) | 92 (30.0) | 67 (32.1) |
| Chills | ‐ | 132 (25.3) | 85 (27.7) | 63 (30.1) |
| Cold symptoms b | ‐ | 136 (26.1) | 62 (20.2) | 41 (19.6) |
| Chest pain or pressure | ‐ | 83 (15.9) | 46 (15.0) | 30 (14.4) |
| Other | 67 (12.9) | 45 (14.7) | 30 (14.4) | |
| Anorexia | ‐ | 45 (8.6) | 33 (10.8) | 25 (12.0) |
| Vertigo or dizziness | ‐ | 24 (4.6) | 18 (5.9) | 12 (5.7) |
| Sweating or night sweats | ‐ | 25 (4.8) | 15 (4.9) | 8 (8.3) |
| Altered mental status | ‐ | 7 (1.3) | 4 (1.3) | 3 (1.4) |
| Not assessed | ‐ | 6 (1.2) | 1 (0.3) | 0 (0) |
| None | ‐ | 3 (0.6) | 2 (0.65) | 1 (0.5) |
Abbreviations: IQR, interquartile range.
Note: Most subjects had more than 1 symptom, so total % symptoms is greater than 100%.
a
Gastrointestinal symptoms defined as nausea, vomiting, or diarrhea.
b
Cold symptoms defined as productive cough or rhinorrhea.
PCR defined as polymerase chain reaction