Table 3.
Bivariate and multivariate analysis of predicting factors in postvaccination COVID-19 infection among healthcare workers in Tamil Nadu (n=1909)
| Predictors | Event occurred (n=127) N (%) | Event not occurred (n=1782) N (%) | Unadjusted HR (CI) | Adjusted HR (CI) |
|---|---|---|---|---|
| Age (years) | ||||
| <29 | 80 (5.9) | 1269 (94.1) | 0.739 (0.51-1.06) | 0.834 (0.56-1.22) |
| >29 | 47 (8.4) | 513 (91.6) | ||
| Sex | ||||
| Male | 60 (8.2) | 668 (91.8) | 1.526 (1.07-2.16)* | 1.422 (0.98-2.05) |
| Female | 67 (5.7) | 1114 (94.3) | ||
| Designation | ||||
| Primary-care providers | 110 (7.5) | 1350 (92.5) | 1.931 (1.15-3.22)* | 1.926 (1.14-3.23)* |
| Others | 17 (3.8) | 432 (96.2) | ||
| Chronic illness | ||||
| Present | 13 (6.7) | 181 (93.3) | 0.980 (0.55-1.74) | 0.729 (0.40-1.31) |
| Absent | 114 (6.6) | 1601 (93.4) | ||
| Vaccination status | ||||
| Partially vaccinated | 24 (10.7) | 201 (89.3) | 1.827 (1.17-2.85)* | 1.900 (1.21-2.97)* |
| Fully vaccinated | 103 (6.1) | 1581 (93.9) |
Using Cox regression and hazard analysis. *P<0.05 significant. HR=Hazard ratio, CI=Confidence interval