Table 1: Demographics of Virus Watch study participants at base line recruitment compared to the ONS CIS and 2021 Census.

Characteristic

Virus Watch Participants N (%)

ONS CIS N (%)

Population of England from ONS (%)

All

58,628

535,121

-

Age group (years)*

 

 

 

0-14

6,823 (12%)

-

17%

15-24

4,047 (6.9%)

-

12%

25-44

11,725 (20%)

-

26%

45-64

19,657 (34%)

-

26%

65+

16,376 (28%)

-

19%

Age group (years)*

 

 

 

2-11

4,617 (8%)

33,507 (6%)

13%

12-16

2,623 (5%)

29,147 (5%)

6%

17-24

3,000 (5%)

35,403 (7%)

9%

25-34

4,973 (9%)

52,359 (10%)

14%

35-49

10,406 (18%)

103,068 (19%)

20%

50-69

22,789 (39%)

176,814 (33%)

25%

70+

9,589 (17%)

104,823 (20%)

14%

Sex (including derived)**

 

 

 

Male

26,274 (45%)

252,047 (47%)

49%

Female

31,533 (54%)

283,074 (53%)

51%

Other/Missing/Prefer not to say

 

821 (1.4%)

 

-

 

-

Ethnicity

 

 

 

White

43,968 (75%)

493,026 (92%)

86%

Asian/Asian British

3,155 (5.4%)

22,128 (4%)

7%

Black/ African/Caribbean/Black British

 

 

493 (0.8%)

 

 

5,476 (1%)

 

 

3%

Mixed/Multiple ethnic groups

 

998 (1.7%)

 

9,598 (2%)

 

2%

Other ethnic groups

288 (0.5%)

4,804 (1%)

2%

Missing

9,726 (17%)

89 (0.01%)

-

Region

 

 

 

North East

2,528 (4.3%)

-

5%

North West

5,572 (9.5%)

-

12%

Yorkshire and The Humber

 

3,035 (5.2%)

 

-

 

9%

East Midlands

4,945 (8.4%)

-

8%

West Midlands

3,020 (5.2%)

-

10%

East of England

10,545 (18%)

-

11%

London

9,083 (15%)

-

15%

South East

9,845 (17%)

-

15%

South West

3,956 (6.7%)

-

10%

Wales

1,532 (2.6%)

-

5%

Missing

4,567 (7.8%)

-

-

ONS CIS data obtained from Coronavirus (COVID-19) Infection Survey: quality and methodology information (QMI) [1]. England population estimates from ONS data for age, sex and region drawn from

Population and household estimates, England and Wales: Census 2021, while data for ethnicity was drawn from Ethnic group, England and Wales: Census 2021

*Different categorization of age groups were used in Virus Watch and ONS CIS; **Sex at birth was self-reported. If missing, sex was obtained via data linkage or derived via name- gender matching based on US names from 1930-2015 https://data.world/howarder/gender-by-name