Multiple logistic regression of factors affecting seropositivity
| Variable | OR (95% CI) | Z | P value |
| Age | 1.01 (0.99 to 1.02) | 0.62 | 0.53 |
| Sex (female) | 1.35 (0.93 to 1.98) | 1.56 | 0.12 |
| Ethnicity (BAME) | 1.90 (1.30 to 2.81) | 3.26 | 0.001 |
| Household co-occupants | 1.04 (0.91 to 1.20) | 0.59 | 0.55 |
| Index of multiple deprivation score | 1.04 (0.84 to 1.28) | 0.33 | 0.74 |
| Primary symptoms | 1.22 (0.87 to 1.72) | 1.16 | 0.25 |
| Public transport | 0.91 (0.60 to 1.37) | 0.46 | 0.65 |
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 2 weeks prior to isolation were used as independent variables. ORs and 95% CIs are provided. The area under the receiver operator curve of this model was 0.58, p=0.0007.
BAME, black, Asian and minority ethnic.