Table 1.
Characteristics of the study population including vaccination and serology status.
| N (%) | Mean ± Standard Deviation (SD) |
Range | ||
|---|---|---|---|---|
| Age (years) | 43.94 ± 11.30 | 21–77 | ||
| Gender | Female | 535 (67.50) | ||
| Male | 258 (32.50) | |||
| Serology for anti-S-RBD | Positive | 791 (99.75) | ||
| Negative | 2 (0.25) | |||
| No. of serological evaluations | 1 | 620 (78.19) | ||
| 2 | 173 (21.81) | |||
| Night shift status | Yes | 435 (54.85) | ||
| No | 358 (45.25) | |||
| SARS-CoV-2 infection | Before vaccination | 25 (3.15) | ||
| After vaccination | 13 (1.65) | |||
| Anti S-RDB titer (U/mL) | <90 days | 1602.3 | 0–2500 | |
| 91–150 days | 1035.9 | 0–2500 | ||
| >150 days | 724.4 | 0–2500 | ||
| Job task | Physician | 262 (33.00) | ||
| Nurse | 269 (33.90) | |||
| Other HCWs * | 262 (33.00) | |||
| Days elapsed between the final vaccine dose and the last serology evaluation | 123 ± 65 | 13–253 | ||
| Days between the two serology evaluations | 92 ± 42 | 11–183 |
* Other HCWs include lab technicians, radiology technicians, perfusion technicians (including phlebotomists), neurophysiopathology technicians, administrative personnel, cardiocirculatory physiopathology technicians, psychologists, biologists, dieticians, dental hygienists, speech therapists, orthoptists, and pharmacists.