Table 2

ORs for SARS-CoV-2 seropositivity by ethnicity, with adjustment for age, sex and social factors

OR (95% CI)Per cent reduction in LR statistics for ethnicity
WhiteBlackSouth AsianChineseMixedOther
Baseline model
Ethnicity+age+sex1.00 (0.92 to 1.09)2.66 (1.98 to 3.59)1.66 (1.18 to 2.35)0.99 (0.46 to 2.13)1.42 (1.05 to 1.91)1.79 (1.30 to 2.48)
Further adjustment
Geographical factors
 Urban-rural classification1.00 (0.92 to 1.09)2.53 (1.88 to 3.41)1.60 (1.13 to 2.25)0.95 (0.44 to 2.04)1.39 (1.03 to 1.88)1.73 (1.25 to 2.39)11
 UK region1.00 (0.92 to 1.09)2.24 (1.66 to 3.02)1.44 (1.02 to 2.03)0.89 (0.41 to 1.92)1.35 (1.00 to 1.82)1.54 (1.11 to 2.14)36
 All1.00 (0.92 to 1.09)2.21 (1.64 to 2.99)1.42 (1.01 to 2.01)0.88 (0.41 to 1.90)1.34 (0.99 to 1.81)1.53 (1.11 to 2.12)38
Occupational factors
 Workplace location*1.00 (0.92 to 1.09)2.48 (1.84 to 3.34)1.59 (1.12 to 2.24)1.00 (0.47 to 2.16)1.40 (1.04 to 1.89)1.76 (1.28 to 2.44)13
 Work in NHS or social care1.00 (0.92 to 1.09)2.54 (1.88 to 3.43)1.64 (1.16 to 2.32)1.02 (0.47 to 2.19)1.42 (1.05 to 1.91)1.80 (1.30 to 2.48)7
 Work in close proximity with public/coworkers1.00 (0.92 to 1.09)2.45 (1.82 to 3.30)1.58 (1.12 to 2.23)1.00 (0.46 to 2.15)1.42 (1.05 to 1.91)1.73 (1.25 to 2.40)15
 All1.00 (0.92 to 1.09)2.37 (1.76 to 3.21)1.54 (1.09 to 2.18)1.03 (0.48 to 2.21)1.39 (1.03 to 1.88)1.72 (1.25 to 2.39)21
Household factors
 Number of coresidents aged ≤18 years1.00 (0.92 to 1.09)2.67 (1.98 to 3.59)1.66 (1.18 to 2.35)0.99 (0.46 to 2.12)1.42 (1.05 to 1.92)1.80 (1.30 to 2.48)0
 Number of coresidents aged >18 years1.00 (0.92 to 1.09)2.65 (1.97 to 3.57)1.52 (1.07 to 2.15)0.97 (0.45 to 2.09)1.41 (1.05 to 1.91)1.73 (1.25 to 2.39)8
 Has a coresident who works outside the home1.00 (0.92 to 1.09)2.61 (1.94 to 3.51)1.61 (1.14 to 2.28)1.01 (0.47 to 2.16)1.42 (1.05 to 1.92)1.75 (1.26 to 2.42)6
 All1.00 (0.92 to 1.09)2.63 (1.95 to 3.54)1.53 (1.08 to 2.17)0.99 (0.46 to 2.12)1.42 (1.05 to 1.92)1.71 (1.23 to 2.36)9
Shopping frequency/use of public transport
 Frequency of shopping1.00 (0.92 to 1.09)2.62 (1.95 to 3.53)1.63 (1.16 to 2.30)0.95 (0.44 to 2.05)1.41 (1.04 to 1.9)1.77 (1.28 to 2.45)5
 Use of public transport1.00 (0.92 to 1.09)2.53 (1.88 to 3.41)1.62 (1.15 to 2.28)0.95 (0.44 to 2.05)1.40 (1.04 to 1.89)1.75 (1.27 to 2.42)11
 All1.00 (0.92 to 1.09)2.54 (1.88 to 3.42)1.63 (1.15 to 2.30)0.95 (0.44 to 2.03)1.39 (1.03 to 1.88)1.75 (1.27 to 2.42)10
Deprivation and education
 Deprivation level1.00 (0.92 to 1.09)2.49 (1.85 to 3.36)1.67 (1.18 to 2.35)1.01 (0.47 to 2.16)1.41 (1.04 to 1.90)1.74 (1.26 to 2.40)11
 Highest level of education1.00 (0.92 to 1.09)2.62 (1.95 to 3.53)1.65 (1.17 to 2.33)0.99 (0.46 to 2.12)1.42 (1.05 to 1.91)1.79 (1.30 to 2.47)3
 All1.00 (0.92 to 1.09)2.46 (1.82 to 3.31)1.66 (1.18 to 2.34)1.01 (0.47 to 2.16)1.41 (1.04 to 1.9)1.73 (1.25 to 2.39)13
All variables1.00 (0.91 to 1.10)1.83 (1.34 to 2.50)1.2 (0.84 to 1.71)0.89 (0.41 to 1.93)1.31 (0.97 to 1.77)1.35 (0.97 to 1.87)67

  • Analysis among 14 571 participants; exclusions as in figure 1. ORs relative to participants of White ethnicity, adjusted for age and sex (baseline model), with further adjustment for social factors where indicated; group-specific variances used to calculate 95% CIs. See online supplemental table S3 for further details on characteristics. LR statistic for ethnicity in the baseline model=48.21.

  • *Workplace location (mid-March to end of June 2020): working from home, working outside home, other.

  • LR, likelihood ratio; NHS, National Health Service.