Table 2.
Multivariable Poisson regression for estimating the relative incidence rates of COVID-19 among screened HCWs, considering potential risk factors
| HCWs characteristics | Adjusted IRR(95%CI) | P |
|---|---|---|
| Age (years) | 1.02 (0.99–1.05) | 0.137 |
| Length of service (years) | 0.98 (0.96–1.01) | 0.175 |
| Sex | ||
| Men | 1.37 (0.97–1.92) | 0.076 |
| Women | 1 | |
| Job category | ||
| Administrative staff | 1.24 (0.60–2.55) | 0.556 |
| Health care assistant | 1.08 (0.64–1.83) | 0.768 |
| Nurse | 1.49 (0.97–2.30) | 0.070 |
| Physician | 1 | |
| Working environment | ||
| Without contact with patients | 0.67 (0.30–1.48) | 0.322 |
| COVID ward | 2.81 (1.95–4.03) | <0.0001 |
| Other clinical ward | 1 | |
| BMI (kg/m2) | 1.03 (1.00–1.06) | 0.031 |
| Hypertension | ||
| No | 1 | |
| Yes | 1.01 (0.58–1.75) | 0.968 |
| Smoking habit | ||
| Never | 1 | |
| Former | 1.83 (1.27–2.62) | 0.001 |
| Current | 0.43 (0.23–0.80) | 0.008 |
| Alcohol consumption | ||
| None or moderate | 1 | |
| Not moderate | 0.53 (0.17–1.64) | 0.271 |
Notes: BMI=Body Mass Index
Sample size analyzed: 1022 HCWs with no-missing information for all variables considered. Adjusted IRR, 95% confidence intervals (95% CI) and P values (P) were obtained: (i)for the categorical variables comparing the different categories relative to the reference category indicated by IRR = 1; (ii)per one unit increase of the continuous variables.