Variable | SAR (%) (95% CI) | Unadjusted OR (95% CI) | P value | Adjusted OR (95% CI) | P value |
Close contact characteristics | |||||
Sex | |||||
Male | 21.5 (19.9 to 23.2) | 1.05 (0.92 to 1.20) | 0.490 | 1.12 (0.94 to 1.33) | 0.210 |
Female | 20.7 (19.2 to 22.3) | 1.00 (reference) | – | 1.00 (reference) | – |
Age | |||||
<14 years | 20.3 (15.1 to 26.3) | 1.00 (reference) | – | 1.00 (reference) | – |
14–18 years | 14.7 (10.1 to 20.3) | 0.68 (0.41 to 1.13) | 0.136 | 0.70 (0.41 to 1.21) | 0.197 |
19–29 years | 19.2 (16.6 to 22.0) | 0.93 (0.64 to 1.36) | 0.724 | 0.95 (0.63 to 1.42) | 0.802 |
30–59 years | 21.5 (19.5 to 23.7) | 1.08 (0.76 to 1.54) | 0.676 | 1.03 (0.70 to 1.51) | 0.889 |
60 years | 20.0 (17.3 to 22.9) | 0.98 (0.68 to 1.43) | 0.933 | 0.98 (0.66 to 1.50) | 0.889 |
Type of contact | |||||
Household | 25.7 (24.3 to 27.2) | 1.00 (reference) | – | 1.00 (reference) | – |
Work | 14.8 (11.6 to 18.5) | 0.57 (0.44 to 0.75) | <0.001 | 1.12 (0.68 to 1.85) | 0.647 |
Social | 14.3 (11.3 to 17.7) | 0.60 (0.46 to 0.79) | <0.001 | 0.72 (0.50 to 1.01) | 0.069 |
Type of relationship | |||||
Spouse | 32.7 (29.1 to 36.4) | 2.81 (2.22 to 3.56) | <0.001 | 3.85 (2.60 to 5.70) | <0.001 |
Relative | 20.8 (19.5 to 22.3) | 1.53 (1.26 to 1.85) | <0.001 | 1.89 (1.33 to 2.70) | <0.001 |
Non-relative | 15.7 (12.6 to 17.0) | 1.00 (reference) | – | 1.00 (reference) | – |
Primary case characteristics | |||||
Socioeconomic strata | |||||
High | 15.7 (8.1 to 26.3) | 1.00 (reference) | – | 1.00 (reference) | – |
Middle high | 23.2 (16.1 to 31.6) | 1.62 (0.75 to 3.49) | 0.217 | 2.63 (0.93 to 7.45) | 0.067 |
Middle | 17.3 (14.3 to 20.7) | 1.12 (0.57 to 2.21) | 0.738 | 1.38 (0.55 to 3.47) | 0.489 |
Middle low | 23.2 (21.5 to 24.9) | 1.62 (0.84 to 3.10) | 0.147 | 2.06 (0.85 to 4.98) | 0.108 |
Low | 20.0 (18.1 to 22.2) | 1.35 (0.70 to 2.60) | 0.373 | 1.84 (0.76 to 4.49) | 0.178 |
Very low | 15.9 (11.4 to 21.3) | 1.01 (0.48 to 2.11) | 0.977 | 1.41 (0.53 to 3.74) | 0.495 |
Type of healthcare insurance | |||||
Contributory | 21.7 (20.5 to 23.0) | 1.00 (reference) | – | 1.00 (reference) | – |
Subsidised | 16.2 (12.7 to 20.2) | 0.70 (0.53 to 0.92) | 0.010 | 0.72 (0.51 to 1.02) | 0.064 |
No affiliation | 20.5 (16.6 to 24.8) | 0.56 (0.72 to 1.20) | 0.563 | 0.58 (0.41 to 0.83) | 0.030 |
Household size | |||||
≤3 cohabitants | 19.9 (18.2 to 21.6) | 1.00 (reference) | – | 1.00 (reference) | – |
>3 cohabitants | 22.2 (20.7 to 23.8) | 1.15 (1.00 to 1.32) | 0.048 | 1.16 (0.97 to 1.38) | 0.115 |
Symptomatic primary case | |||||
Yes | 25.9 (24.0 to 27.9) | 1.60 (1.39 to 1.83) | <0.001 | 1.48 (1.24 to 1.77) | <0.001 |
No | 18.0 (16.6 to 19.4) | 1.00 (reference) | – | 1.00 (reference) | – |
Primary case occupation | |||||
Healthcare worker | 19.5 (15.8 to 23.8) | 1.00 (reference) | – | 1.00 (reference) | – |
Police/military/firefighter | 27.4 (21.3 to 34.1) | 1.55 (1.04 to 2.30) | 0.030 | 1.22 (0.73 to 2.05) | 0.443 |
Construction worker | 19.3 (10.0 to 31.9) | 0.98 (0.49 to 1.99) | 0.964 | 0.73 (0.25 to 1.84) | 0.441 |
Costumer/general service | 20.5 (18.0 to 23.1) | 1.06 (0.79 to 1.41) | 0.699 | 1.20 (0.82 to 1.73) | 0.347 |
Essential office work | 22.0 (19.3 to 24.8) | 1.16 (0.86 to 1.55) | 0.324 | 1.14 (0.78 to 1.67) | 0.483 |
Informal employment/looking for a job | 29.1 (25.5 to 32.8) | 1.69 (1.24 to 2.28) | 0.001 | 1.73 (1.17 to 2.58) | 0.006 |
Public/private driver | 14.9 (12.2 to 17.9) | 0.72 (0.52 to 1.00) | 0.050 | 0.71 (0.47 to 1.01) | 0.108 |
Teacher/auxiliary/student | 22.1 (18.8 to 25.6) | 1.17 (0.85 to 1.60) | 0.336 | 1.48 (0.99 to 2.24) | 0.059 |
Other occupation* | 17.5 (14.2 to 21.1) | 0.87 (0.62 to 1.22) | 0.421 | 1.19 (0.78 to 1.83) | 0.418 |
*Other occupations: cooks, musicians, technicians, veterinarians, among others.