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We saw increasing proportions of positive tests in the three weeks post-lockdown amongst the ethnic minority , but not the White, cohort.
We used logistic regression to identify sociodemographic, clinical and temporal factors associated with SARS-CoV-2 PCR positivity before/after lockdown.
Individual ethnic minority groups were compared to White individuals using Wilcoxon rank-sum test for non-parametric data and chi-square statistic for categorical variables.
Those from ethnic minority groups had significantly greater estimated household sizes than those of White ethnicity (2.4 vs 2.9, p<0.0001).
The factors underlying a differential effect of lockdown measures on viral transmission in different ethnic groups would likely be multidimensional.