Table 1.

Participants in the UK Biobank versus 2001 UK Census data for sex, age, ethnicity and socio-economic status. Sex and ethnicity are shown as percentages while socio-economic status is reported as average Townsend deprivation index score (with standard deviation).

		UK Biobank	UK Census 2001
Sex	Male	45.6	49.2
Age group (years)	40–44	10.4	20.1
	45–49	13.2	18.0
	50–54	15.3	19.3
	55–59	18.2	16.3
	60–64	24.3	13.8
	65–69	18.7	12.5
Ethnicity	White	94.1	91.3
	Mixed	0.6	1.3
	Asian or Asian British	2.0	4.4
	Black or Black British	1.6	2.2
	Chinese	0.3	0.4
	Other ethnic group	0.9	0.4
	Prefer not to answer	0.3	-
	Missing data	0.2	-
Socioeconomic status	Mean Townsend score* (SD)	−1.3 (3.1)	0.7 (4.2)

^*Lower Townsend scores indicate less deprivation