Table 2.

Factors associated with SARS-CoV-2 seropositivity: multivariable analysis

	Adjusted OR (95% CI)*	P value
Sex		0.034
Male	1 (ref)
Female	1.8 (1.0 to 3.3)	0.034
Age (years)		<0.001
6–14	1.8 (0.53 to 6.1)	0.344
15–19	9.1 (2.8 to 29.8)	<0.001
20–64	4.5 (2.0 to 10.1)	<0.001
≥65	1 (ref)
Obesity†		0.024
No	1 (ref)
Yes	2.0 (1.1 to 3.8)	0.024
Other medical conditions‡		0.004
No	1 (ref)
Yes: one	1.1 (0.57 to 2.0)	0.863
Yes: several	3.2 (1.6 to 6.3)	0.001
Clinical COVID-19 cases in the household§		<0.001
No	1 (ref)
1 person	2.5 (1.3 to 5.0)	0.007
>1 person	6.9 (3.1 to 15.2)	<0.001
Went out for work during the lockdown		0.048
No	1 (ref)
Yes	0.18 (0.03 to 1.0)	0.048
Number of rooms by neighbourhood¶		0.007
Neighbourhood A
1–2	2.8 (1.2 to 6.3)	0.016
3	2.2 (1.0 to 5.0)	0.064
≥4	1 (ref)
Neighbourhood B
1–2	1.5 (0.3 to 6.4)	0.594
3	0.23 (0.04 to 1.2)	0.075
≥4	1 (ref)
Neighbourhood C
1–2	0.58 (0.22 to 1.5)	0.262
3	2.3 (0.91 to 5.9)	0.078
≥4	1 (ref)

*Adjusted OR with corresponding 95% CIs and p values from multivariable logistic regression. Analysis performed on 655 of 700 sampled individuals.

†For those aged 18 years or older: BMI ≥30 kg/m²; for those aged 6–17 years: BMI (body mass index) ≥IOTF (International Obesity Task Force) -30 cut-off points.

‡Other medical conditions including: asthma, other respiratory diseases, hypertension, heart disease, treated diabetes, treated cancer (excluding hormone therapy), HIV and immunodeficiency, chronic liver disease, chronic kidney disease, neuromuscular diseases.

§Clinical COVID-19 cases in the household: number of people, except the respondent, with clinical signs of COVID-19 (cough, fever), a positive RT-PCR test or who were consulted for suspected COVID-19 since 24 February 2020.

¶Model includes an interaction term: number of rooms×neighbourhood.

IOTF, International Obesity Task Force.