Table 3.

Logistic Regression Presenting the Crude and Adjusted Risk of SARS-CoV-2 Infection (Positive RT-PCR Test Result) for the Study sample

	Unadjusted OR	95% CI	pa	Adjusted OR	95% CI	pa
Sociodemographic characteristics
Age (years)
18–29	1·03	[0·90, 1·17]	0·001	1·22	[1·05, 1·41]	0·098
30–59	0·88	[0·78, 1·00]		1·06	[0·92, 1·21]
> 60	··	··		··	··
Prefer not to answer	0·53	[0·30, 0·93]		0·40	[0·21, 0·74]
Sex
Female	··	··	0·175	··	··	0·305
Male	1·04	[0·97, 1·12]		1·01	[0·94, 1·09]
Ethnic minority b
No	1·20	[0·91, 1·60]	0·183	1·32	[0·99, 1·77]	0·016
Yes	··	··		··	··
Immigrant
No	··	··	<0·001	··	··	0·506
Yes	1·51	[1·23, 1·86]		1·12	[0·89, 1·40]
Use of protective elements, type of occupation, and contact with COVID-19
Frequency of hand washing (times per day)
< 10	··	··	<0·001	··	··	0·159
≥ 10	0·82	[0·76, 0·89]		0·99	[0·91, 1·07]
Do not know / no answer	1·12	[0·88, 1·42]		0·90	[0·64, 1·28]
Duration of hand washing (seconds)
< 20	··	··	0·216	··	··	0·108
≥ 20	0·96	[0·89, 1·04]		1·05	[0·97, 1·14]
Do not know / no answer	··	··		··	··
Use of hand sanitizer
Yes	0·81	[0·72, 0·91]	0·001	*	*	*
No	··	··		*	*
Use of facemask during the day
Always	0·54	[0·43, 0·67]	<0·001			*
Sometimes	0·49	[0·39, 0·62]		*	*
Never	··	··		*	*
Number of cohabitants
> 3	1·37	[1·28, 1·47]	<0·001	1·27	[1·17, 1·36]	<0·001
≤ 3	··	··		··	··
Occupation
Health worker	··	··	<0·001	··	··	0·004
Essential office work	1·48	[1·27, 1·72]		1·37	[1·17, 1·61]
Police/military/firefighter	3·06	[2·48, 3·77]		2·27	[1·80, 2·86]
Public/private driver	1·99	[1·67, 2·37]		1·43	[1·17, 1·74]
Construction worker	2·19	[1·58, 3·04]		1·90	[1·35, 2·68]
Contact with costumers/general service	2·38	[2·07, 2·74]		1·15	[1·30, 1·77]
Teacher/auxiliar/student	1·72	[1·47, 2·02]		1·13	[0·94, 1·35]
Other occupation c	1·44	[1·21, 1·70]		1·28	[1·07, 1·52]
Informal employment/looking for a job	2·65	[2·27, 3·10]		1·61	[1·34, 1·93]
Use of public transportation
Public transport	1·14	[1·03, 1·27]	<0·001	1·03	[0·92, 1·14]	<0·001
Private transport/walking	··	··		··	··
Do not know / no answer	1.83	[1·68, 1·99]		1·41	[1·27, 1·56]
Living with a COVID-19 confirmed case
Yes	2·69	[2·44, 2·98]	<0·001	2·21	[1·99, 2·46]	<0·001
No	··	··		··	··
Do not know / no answer	2·40	[2·14, 2.69]		1·21	[1·00, 1·45]
Socioeconomic characteristics
Type of health care insurance
Contributive, special, exception	··	··	<0·001	··	··	<0·001
Subsidiary	2·22	[2·00, 2·47]		1·50	[1·33, 1·69]
No affiliated, no determined	2·15	[1·90, 2·44]		1·58	[1·38, 1·82]
Socioeconomic strata d
High	··	··	<0·001	··	··	<0·001
Middle-high	1·22	[0·87, 1·70]		1·15	[0·82, 1·62]
Middle	1·43	[1·07, 1·93]		1·37	[1·02, 1·85]
Middle-low	2·64	[2·00, 3·50]		2·33	[1·75, 3·09]
Low	3·04	[2·29, 4·04]		2·55	[1·91, 3·40]
Low-low	5·78	[4·29, 7·81]		3·91	[2·86, 5·35]
Do not know / no answer	6·38	[4·40, 9·25]		3·23	[2·13, 4·89]

^⁎= Variables not retained in the final logistic regression model (p ≥ 0·20).

^ap value for the Wald test in the logistic regression.

^bEthnic groups: Indigenous, Black, Mulatto, and Gypsy.

^cOther occupations: actors, cooks, musicians, technicians, veterinarians, among others.

^dSocioeconomic strata as defined by the National Department of Statistics (DANE) of Colombia: 1 (very low strata) to 6 (high strata).