Table 2.
Multivariate analysis of factors associated with positive SARS-CoV-2 nucleic tests (N=15 690)
| Univariate analysis, OR (95% CI) | Final model with fully adjusted OR (95% CI)* | P value | |
| Sex | |||
| Male | Reference | Reference | 0.18 |
| Female | 0.84 (0.59 to 1.21) | 0.78 (0.54 to 1.12) | |
| Age | |||
| 1.00 (1.00 to 1.02) | 1.00 (0.99 to 1.01) | 0.27 | |
| 7-day average incident COVID-19 cases | |||
| 0–1.99 daily cases per 100 000 population | Reference | Reference | <0.001 |
| 2–7.99 daily cases per 100 000 population | 1.42 (0.91 to 2.22) | 1.47 (0.94 to 2.31) | |
| ≥8 daily cases per 100 000 population | 2.99 (1.95 to 4.59) | 3.17 (2.05 to 4.89) | |
| COVID-19-compatible symptoms present | |||
| No | Reference | Reference | 0.08 |
| Yes | 2.08 (1.71 to 3.71) | 1.65 (0.90 to 3.00) | |
| Self-reported fever or temperature ≥37.5°C | |||
| No | Reference | Reference | <0.001 |
| Yes | 2.72 (1.89 to 3.90) | 2.53 (1.74 to 3.67) | |
| Diarrhoea present | |||
| No | Reference | Reference | 0.11 |
| Yes | 1.74 (1.04 to 2.92) | 1.57 (0.93 to 2.67) | |
| Healthcare worker | |||
| No | Reference | Reference | 0.06 |
| Yes | 5.62 (1.35 to 23.43) | 4.67 (1.05 to 20.54) | |
| Household contact or caregiver | |||
| No | Reference | Reference | <0.001 |
| Yes | 9.48 (5.01 to 17.96) | 7.74 (3.98 to 15.04) | |
| Institutional exposure | |||
| No | Reference | Reference | <0.001 |
| Yes | 3.46 (2.17 to 5.52) | 3.39 (2.10 to 5.47) | |
| Dysgeusia or anosmia present | |||
| No | Reference | – | |
| Yes | 3.21 (0.43 to 23.52) | – | |
| Dyspnoea present | |||
| No | Reference | – | |
| Yes | 1.16 (0.80 to 1.70) | – | |
| Nausea or vomiting present | |||
| No | Reference | – | |
| Yes | 0.81 (0.51 to 1.29) | – | |
*Final model determined by including variables with p<0.20 from univariable analyses and using the Akaike’s information criterion to determine additional variables to exclude from the final model. Variables adjusted for all other variables present in the final model.