Table 1. Demographic and Clinical Characteristics According to Vaccine Risk Category (Nā=ā1917).
| Characteristic | No. (%) | P value | No. (%) | P value | |||
|---|---|---|---|---|---|---|---|
| Total participants | SARS-CoV-2 reinfection | Unvaccinated | Partially | Fully | |||
| No. | 1917 | 116a | 472 | 356 | 1089 | ||
| Age, y | |||||||
| <25 | 157 (8.2) | 15 (12.9) | .08 | 53 (11.2) | 32 (9.0) | 72 (6.6) | <.001 |
| 25-44 | 1228 (64.1) | 76 (65.5) | 335 (71.0) | 233 (65.4) | 660 (60.6) | ||
| ā„45 | 532 (27.8) | 25 (21.6) | 84 (17.8) | 91 (25.6) | 357 (32.8) | ||
| Sex | |||||||
| Male | 1107 (57.7) | 62 (53.5) | .33 | 247 (52.3) | 192 (53.9) | 668 (61.3) | .001 |
| Female | 810 (42.3) | 54 (46.5) | 225 (47.7) | 164 (46.1) | 421(38.7) | ||
| Type of HCW | |||||||
| Student, administrative and/or clerical staff | 182 (9.5) | 8 (6.9) | .02 | 49 (10.4) | 44 (12.4) | 89 (8.2) | <.001 |
| Faculty, scientist, research staff | 151 (7.9) | 7 (6.0) | 34 (7.2) | 28 (7.9) | 89 (8.2) | ||
| Nursing staff | 638 (33.3) | 53 (45.7) | 193 (40.9) | 135 (37.9) | 310 (28.5) | ||
| Junior or senior resident | 183 (9.6) | 14 (12.1) | 27 (5.7) | 43 (12.1) | 113 (10.4) | ||
| Paramedical or support staff | 763 (39.8) | 34 (29.3) | 169 (35.8) | 106 (29.8) | 488 (44.8) | ||
| BMI | |||||||
| <18.5 | 47 (2.4) | 2 (1.7) | .60 | 13 (2.8) | 12 (3.4) | 22 (2.0) | .23 |
| 18.5-24.9 | 917 (47.8) | 61 (52.6) | 236 (50.0) | 178 (50.0) | 503 (46.2) | ||
| 25.0-29.9 | 745 (38.9) | 39 (33.6) | 168 (35.6) | 136 (38.2) | 441 (40.5) | ||
| ā„30 | 208 (10.9) | 14 (12.1) | 55 (11.7) | 30 (8.4 | 123 (11.3) | ||
| Comorbidityb | b426 (22.2) | 33 (28.5) | .09 | 110 (23.3) | 91 (25.6) | 225 (20.7) | .13 |
| First episode COVID-19 symptom status | |||||||
| Asymptomatic | 279 (14.6) | 15 (12.9) | .61 | 82 (17.4) | 50 (14.0) | 147 (13.5) | .13 |
| Symptomatic | 1638 (85.4) | 101 (87.1) | 390 (82.6) | 306 (86.0) | 942 (86.5) | ||
Abbreviations: BMI, body mass index (calculated as weight in kilograms divided by height in meters squared); HCW, health care worker.
a
Of 124 reinfection events, 116 were included in the analysis because 5 were reinfected before vaccine rollout and 3 received a different vaccine.
b
Defined as diabetes; hypertension; chronic heart, lung, or kidney disease; cancer; hypothyroidism; or other self-reported chronic condition.