Table 1. Demographic characteristics and antibody reactivity of participants.
| Characteristics | Participants n (%) | Positive SARS-CoV-2 IgG S1/S2 n (%) | Positive SARS-CoV-2 IgG S1/S2 or SARS-CoV-2 IgG N n (%)* | No. negative IgG S1/S2 (%) | No. negative IgG N (%) |
|---|---|---|---|---|---|
| Entire sample | 7563 (100) | 712 (9.41) | 779 (10.30) | 6801 (83.92) | 519/591**(87.82) |
| Sex | |||||
| Male | 1789 (23.65) | 181 (10.11) | 192 (10.73) | 1597 (89.27) | 106 (5.92) |
| Female | 5673 (75) | 522 (9.20) | 575 (10.13) | 5144 (90.68) | 407 (7.17) |
| NA | 101 (1.33) | 9 (9.73) | 12 (11.88) | 90 (89.11) | 6 (5.94) |
| Age | |||||
| 18–34 | 2025 (26.78) | 209 (23.36) | 228 (11.25) | 1806 (89.19) | 169 (8.34) |
| 35–54 | 3664 (48.45) | 330 (9) | 354 (9.61) | 3321 (90.64) | 241(6.58) |
| ≥55 | 1771 (23.42) | 179 (25.14) | 186 (10.50) | 1582 (89.33) | 103 (5.81) |
| NA | 103(1.36) | 9 (1.26) | 12 (11.43) | 92 (89.32) | 6 (5.82) |
| Location | |||||
| Primary Care | 4153 (54.91) | 381 (9.17) | 415 (9.99) | 3740 (90.06) | 283 (6.81) |
| Tertiary Care | 3410 (45.09) | 331 (9.71) | 364 (10.67) | 3061 (89.77) | 236 (6.92) |
| Health Care Job | |||||
| Nurse | 2243 (29.64) | 216 (9.62) | 239 (10,64) | 2016 (89.88) | 173 (7.71) |
| Physician | 1821 (24.08) | 192 (26.96) | 215 (11.70) | 1612 (87.70) | 126 (6.92) |
| Nursing Assistant | 832 (11) | 85 (11.93) | 116 (10.52) | 745 (89.54) | 55 (6.61) |
| Health Care Support Services | 429 (5.67) | 33 (4.63) | 33 (7.69) | 394 (91.84) | 27 (6.29) |
| Administrative Healthcare | 1181 (15.62) | 75 (10.53) | 77 (6.52) | 1097 (92.89) | 71 (6.01) |
| Other | 616 (8.14) | 51 (7.16) | 52 (8.44) | 562 (91.23) | 22 (3.57) |
| NA | 441 (5.83) | 60 (8.42) | 69 (15.65) | 375 (85.03) | 45 (10.220) |
| COVID Symptoms | |||||
| Yes | 3475 (45.95) | 523 (15.05) | 567 (16.32) | 2923 (63.61) | 232 (6.68) |
| No | 3646 (48.21) | 129 (3.53) | 143 (3.92) | 3502 (96.05) | 243 (6.66) |
| NA | 442 (5.84) | 60 (13.57) | 69 (5.61) | 376 (85.07) | 44 (9.95) |
| Previous COVID Diagnosis | |||||
| Yes | 385 (5.09) | 291 (75.58) | 313 (81.30) | 82 (21.29) | 21 (5.45) |
| No | 6740 (89.12) | 362 (5.37) | 398 (5.90) | 6346 (94.15) | 456 (6.76) |
| NA | 438 (5.79) | 59 (13.47) | 68 (15.52) | 373 (85.16) | 42 (9.59) |
| SARS-CoV-2 Confirmed rRT-PCR Positive | |||||
| Yes | 341 (4.51) | 279 (81.81) | 301 (88.26) | 50 (14.66) | 16 (4.69) |
| Hospital admitted for COVID | |||||
| Yes | 59 (0.78) | 46 (77.97) | 46 (77.97) | 13 (22.03) | 1 (1.69) |
| No | 7044 (93.14) | 605 (8.59) | 663 (9.41) | 6395 (90.79) | 474 (6.73) |
| NA | 460 (6.08) | 61 (13,26) | 70 (15.20) | 393 (85.43) | 44 (9.56) |
*N antigen determination was performed in 646 participants, according to the laboratory analysis algorithm.
** Total samples IgG S1/S2 (>3.80 AU/mL and <15 AU/mL) negative and processed by Abbott IgG N: 591. NA (Not answered).