Table 2 Cox regression model of variables related to seroconversion (person/days)
Variables | Univariate | Multivariate | ||
|---|---|---|---|---|
HR (95%CI) | p value | HR (95%CI) | p value | |
Gender; Female | 1.45 (0.80–2.63) | 0.22 |  |  |
Older Age | 0.97 (0.95–0.99) | 0.04 | 0.97 (0.94–0.99) | 0.03 |
Work area High-risk for Covid-19 Low-risk for Covid-19 | 2.45 (0.59–10.03) | 0.21 |  |  |
Comorbidities & medications | ||||
Diabetes | 7.04 (1.68–29.61) | 0.008 | 17.42 (3.9–77.83) | 0.00 |
Hypertension | 0.44 (0.11–1.82) | 0.26 |  |  |
Obesity | 0.61 (0.19–1.96) | 0.42 |  |  |
Asthma | 0.98 (0.24–4.00) | 0.98 |  |  |
Smoker | 0.38 (0.17–0.89) | 0.025 | 0.38 (0.16–0.93) | 0.03 |
No comorbidities | 0.78 (0.48–1.28) | 0.33 |  |  |
Use of ACE inhibitors | 0.67 (0.21–2.14) | 0.50 |  |  |
Profession | ||||
Physician | 0.89 (0.54–1.48) | 0.66 |  |  |
Respiratory therapist | 0.91 (0.33–2.51) | 0.86 |  |  |
Nurse | 1.35 (0.81–2.25) | 0.26 |  |  |
Technician/paramedic | 0.87 (0.47–1.60) | 0.65 |  |  |
Administrative worker | 0.05 (0.0–6078.3) | 0.61 |  |  |
Clinical Unit | ||||
Intensive care unit | 0.78 (0.41–1.49) | 0.46 |  |  |
Stepdown unit | 1.37 (0.79–2.37) | 0.26 |  |  |
Medical ward | 1.50 (0.88–2.55) | 0.13 |  |  |
Emergency department | 0.60 (0.33–1.11) | 0.10 |  |  |
Epidemiological risk factors | ||||
Non-occupational Covid-19 contact | 1.41 (0.57–3.52) | 0.46 |  |  |
International travel (previous 3 months) | 1.82 (1.11–2.99) | 0.018 | 1.59 (0.95–2.68) | 0.08 |
Covid-19 related symptoms within 4 weeks of serology testing | ||||
No symptoms | 0.88 (0.53–1.45) | 0.61 |  |  |
Fever | 3.43 (1.07–11.02) | 0.04 | 7.54 (2.24–25.34) | 0.001 |
Cough | 1.47 (0.75–2.88) | 0.27 |  |  |
Myalgia | 0.96 (0.30–3.07) | 0.96 |  |  |
Anosmia or Ageusia | 7.35 (4.47–12.07) | 0.00 | 6.7 (3.89–11.52) | 0.00 |
Chest pain | 2.47 (1.06–5.74) | 0.04 | 1.22 (0.49–3.05) | 0.66 |