Table 2: Multiple logistic regression of factors affecting seropositivity.

Seropositivity at the time of study enrolment was used as the dependent variable. Participants’ age, sex, ethnicity (white vs BAME), number of household co-occupants, the index of multiple deprivation score, whether an individual isolated because they directly experienced symptoms or isolated because a family member experienced symptoms and public transport use in the two weeks prior to isolation were used as independent variables. Odds ratios (OR) and 95% confidence intervals (CI) are provided. The area under the receiver operator curve of this model was 0.58, p=0.0007.

Variable	OR (95% CI)	Z	P-value
Age	1.01 (0.99–1.02)	0.62	0.53
Sex (Female)	1.35 (0.93–1.98)	1.56	0.12
Ethnicity (BAME)	1.90 (1.30–2.81)	3.26	0.001
Household co-occupants	1.04 (0.91–1.20)	0.59	0.55
Index of multiple deprivation score	1.04 (0.84–1.28)	0.33	0.74
Primary symptoms	1.22 (0.87–1.72)	1.16	0.25
Public transport	0.91 (0.60–1.37)	0.46	0.65