Table 4.
Risk of infection of SARS-CoV-2 among cases and controls from the Lisbon and Tagus Valley Region in September and October 2020.
| Variable | Crude odds ratio (95% CI) | P-value | Adjusted odds ratio (95% CI)a | P-value |
|---|---|---|---|---|
| Number of people per room (area ≥ 4 m2) | ||||
| Reference: <1 | (n = 1,378) | (n = 1,360) | ||
| ≥1 | 2.09 (1.60–2.73) | <0.001 | 1.47 (1.10–1.97) | 0.010 |
| Occupation/professional situation | ||||
| Reference: Education | (n = 1,380) | (n = 1,362) | ||
| Civil construction | 3.75 (1.42–10.90) | 0.010 | 1.01 (0.34–3.20) | 0.986 |
| Cleaning | 2.88 (1.26–6.86) | 0.014 | 1.12 (0.46–2.84) | 0.807 |
| Restaurant industry | 2.29 (0.96–5.68) | 0.066 | 0.79 (0.31–2.09) | 0.631 |
| Healthcare | 2.05 (1.01–4.23) | 0.048 | 1.74 (0.81–3.77) | 0.155 |
| Industry | 2.14 (0.74–6.56) | 0.165 | 0.76 (0.24–2.53) | 0.651 |
| Senior care | 10.62 (2.69–71.27) | 0.003 | 4.03 (0.94–28.25) | 0.093 |
| Other occupation | 0.87 (0.50–1.54) | 0.628 | 0.62 (0.34–1.15) | 0.125 |
| Student | 1.85 (0.87–3.96) | 0.110 | 0.41 (0.18–0.97) | 0.042 |
| Retired | 0.43 (0.24–0.79) | 0.006 | 0.49 (0.24–1.01) | 0.052 |
| Unemployed | 1.69 (0.87–3.30) | 0.124 | 0.80 (0.39–1.66) | 0.543 |
| Another professional situation | 1.31 (0.59–1.54) | 0.511 | 0.65 (0.27–1.58) | 0.343 |
| Remote working | ||||
| Reference: No (working in-office) | (n = 1,016) | (n = 1,003) | ||
| Unemployed | 1.09 (0.72–1.67) | 0.680 | 0.80 (0.51–1.28) | 0.353 |
| Yes | 0.21 (0.14–0.30) | <0.001 | 0.27 (0.18–0.40) | <0.001 |
| Used public transportation | ||||
| Reference: No | (n = 1,384) | (n = 1,366) | ||
| At least once | 1.73 (1.32–2.25) | <0.001 | 1.16 (0.86–1.57) | 0.333 |
| Went to restaurants and other dining spaces | ||||
| Reference: No | (n = 1,378) | (n = 1,360) | ||
| At least once | 0.71 (0.57–0.88) | 0.002 | 0.79 (0.61–1.02) | 0.069 |
| Went to grocery stores | ||||
| Reference: No | (n = 1,382) | (n = 1,364) | ||
| At least once | 0.48 (0.37–0.62) | <0.001 | 0.47 (0.35–0.63) | <0.001 |
| Went to shopping malls/shops | ||||
| Reference: No | (n = 1,383) | (n = 1,365) | ||
| At least once | 0.61 (0.48–0.77) | <0.001 | 0.56 (0.43–0.73) | <0.001 |
| Went to hair salons/aesthetic centers | ||||
| Reference: No | (n = 1,383) | (n = 1,365) | ||
| At least once | 0.54 (0.41–0.71) | <0.001 | 0.58 (0.43–0.78) | <0.001 |
| Went to gyms/sports studios | ||||
| Reference: No | (n = 1,379) | (n = 1,361) | ||
| At least once | 1.13 (0.77–1.67) | 0.528 | 1.23 (0.79–1.92) | 0.359 |
Analysis restricted to the cases and controls reporting no known contact with cases of SARS-CoV-2 infection in the reference period.
a
Adjusted for sex, age, education level, and citizenship. 95% CI, 95% Confidence Interval.