Multivariate analysis of seroprevalence by demographic characteristics
| Variable | Prevalence ratios (95% CI) | P value |
| Age (years) | ||
| <30 | 1 | -- |
| 31–59 | 0.93 (0.81 to 1.08) | 0.382 |
| >60 | 0.76 (0.43 to 1.34) | 0.350 |
| Sex | ||
| Female | 1 | — |
| Male | 1.04 (0.89 to 1.22) | 0.572 |
| Socioeconomic strata | ||
| 6 (highest) | 1 | — |
| 1 (lowest) | 3.15 (1.45 to 6.84) | 0.003 |
| 2 | 2.87 (1.34 to 6.16) | 0.006 |
| 3 | 2.31 (1.08 to 4.95) | 0.030 |
| 4 | 1.90 (0.87 to 4.13) | 0.106 |
| 5 | 1.83 (0.81 to 4.16) | 0.143 |
| Blood type | ||
| O | 1 | — |
| B | 1.06 (0.83 to 1.35) | 0.637 |
| AB | 1.68 (1.12 to 2.52) | 0.011 |
| A | 1.13 (0.97 to 1.30) | 0.102 |
| Number of jobs | ||
| 1 | 1 | — |
| >1 | 1.09 (0.91 to 1.32) | 0.333 |
| Service | ||
| Administrative | 1 | — |
| Emergency | 1.57 (1.28 to 1.92) | 0.000 |
| Paediatric ICU | 1.13 (0.70 to 1.81) | 0.605 |
| Adult ICU | 1.15 (0.86 to 1.53) | 0.325 |
| General services | 1.36 (0.55 to 3.35) | 0.496 |
| Radiology | 1.11 (0.62 to 1.97) | 0.713 |
| Clinical laboratory | 0.97 (0.65 to 1.44) | 0.901 |
| Hospitalisation | 1.37 (1.11 to 1.69) | 0.003 |
| Pharmacy | 0.71 (0.17 to 2.91) | 0.643 |
| Ambulatory service | 1.05 (0.78 to 1.41) | 0.725 |
| Surgery | 1.36 (0.95 to 1.96) | 0.087 |
| Comorbidities | ||
| No | 1 | — |
| Yes | 1.00 (0.85 to 1.18) | 0.919 |
| Tobacco usage | ||
| No | 1 | — |
| Former smoker | 1.03 (0.76 to 1.39) | 0.824 |
| Smoker | 0.97 (0.73 to 1.30) | 0.881 |
| City | ||
| Bogotá | 1 | — |
| Bucaramanga | 0.75 (0.58 to 0.97) | 0.028 |
| Villavicencio | 1.46 (1.17 to 1.84) | 0.000 |
| Medellín | 0.74 (0.55 to 0.98) | 0.038 |
| Cali | 1.00 (0.76 to 1.33) | 0.956 |
| Cúcuta | 0.72 (0.55 to 0.94) | 0.016 |
| Barranquilla | 1.18 (0.90 to 1.55) | 0.224 |
| Guapi | 1.60 (1.09 to 2.34) | 0.014 |
| Leticia | 0.00 (0.00 to 2.75) | 0.968 |
| Ipiales | 0.90 (0.69 to 1.16) | 0.427 |
| Household size (people) | ||
| 1 | 1 | — |
| >1 | 1.05 (1.00 to 1.12) | 0.050 |
Results of multiple Poisson regression of the association between seropositivity to SARS-CoV-2 and sociodemographic characteristics. Prevalence ratios estimated using the best fitting model are reported.
ICU, intensive care unit.