Variable | Total N=4981 | Secondary cases n=1050 | Test-negative or untested contacts n=3931 | P value |
Close contact characteristics | ||||
Sex | 0.490 | |||
Female | 2604 (52.3) | 539 (51.3) | 2065 (52.5) | |
Male | 2377 (47.7) | 511 (48.7) | 1866 (47.5) | |
Age (years) | 0.194 | |||
<14 | 212 (5.9) | 43 (5.9) | 169 (5.9) | |
14–18 | 204 (5.7) | 30 (4.1) | 174 (6.0) | |
19–29 | 833 (23.1) | 160 (22.0) | 673 (23.4) | |
30–59 | 1546 (43.8) | 333 (45.7) | 1213 (42.1) | |
≥60 | 814 (22.6) | 163 (22.4) | 651 (22.6) | |
No data | 1372 (27.5) | 321 (30.7) | ||
Type of contact | <0.001 | |||
Household | 3949 (81.0) | 888 (86.8) | 3061 (79.4) | |
Work | 491 (10.1) | 70 (6.8) | 421 (10.9) | |
Social | 238 (9.0) | 65 (6.4) | 373 (9.7) | |
Type of relationship | <0.001 | |||
Spouse | 655 (13.3) | 214 (20.6) | 441 (11.4) | |
Relative | 3219 (65.3) | 671 (64.5) | 2548 (65.6) | |
Non-relative | 1053 (21.4) | 155 (14.9) | 898 (23.1) | |
Primary case characteristics | ||||
Socioeconomic strata | 0.004 | |||
High | 70 (1.4) | 11 (1.1) | 59 (1.5) | |
Middle high | 125 (2.5) | 29 (2.8) | 96 (2.5) | |
Middle | 566 (11.4) | 98 (9.4) | 468 (12.0) | |
Middle low | 2476 (50.0) | 574 (54.9) | 1902 (48.7) | |
Low | 1484 (30.0) | 298 (28.5) | 1186 (30.4) | |
Very low | 227 (4.6) | 36 (3.4) | 191 (4.9) | |
Type of healthcare insurance | 0.034 | |||
Contributory | 4162 (84.0) | 904 (86.2) | 3258 (83.4) | |
Subsidised | 401 (8.1) | 65 (6.2) | 336 (8.6) | |
No affiliation | 391 (7.9) | 80 (7.6) | 311 (8.0) | |
Household size | 0.048 | |||
≤3 cohabitants | 2145 (43.3) | 426 (40.6) | 1719 (44.0) | |
>3 cohabitants | 2809 (56.7) | 623 (59.4) | 2186 (56.0) | |
Symptomatic primary case | <0.001 | |||
Yes | 1990 (40.2) | 516 (49.2) | 1474 (37.8) | |
No | 2964 (59.8) | 533 (50.8) | 2431 (62.2) | |
Primary case occupation | <0.001 | |||
Healthcare worker | 399 (8.1) | 78 (7.4) | 321 (8.2) | |
Police/military/firefighter | 201 (4.1) | 55 (5.2) | 146 (3.7) | |
Construction worker | 57 (1.2) | 11 (1.1) | 46 (1.2) | |
Costumer/general services | 1031 (20.8) | 211 (20.1) | 820 (21.0) | |
Essential office work | 901 (18.2) | 198 (18.9) | 703 (18.0) | |
Informal employment/looking for a job | 623 (12.6) | 181 (17.3) | 442 (11.3) | |
Public/private driver | 645 (13.0) | 96 (9.2) | 539 (14.1) | |
Teacher/auxiliary/student | 593 (12.0) | 131 (12.5) | 462 (11.8) | |
Other occupation* | 504 (10.2) | 88 (8.4) | 416 (10.7) |
Age was missing in 1372 cases (321 missing secondary cases, 1051 negative cases); type of close contact was missing in 303 close contacts; type of relationship was missing for 54 close contacts.
*Other occupations: cooks, musicians, technicians, veterinarians, among others.