Table 1.

Participants in the Health Survey for England 1994, 1998 and 2003

	1994	1998	2003	All
Sampling units	720	720	720
Addresses selected within sampling units	12,960	13,680	13,680	40,320
Eligible addresses*	11,515	12,250	12,036	35,801
Eligible households†	11,709	12,446	12,195	36,350
Co-operating households**	9,068	9,208	8,867	27,143
Adults aged 45+ living in co-operating households	8,257	8,688	8,625	25,570
Adults aged 45+ who completed individual questionnaire	7,751	8,181	8,009	23,941
White adults aged 45+ who completed individual questionnaire	7,492	7,908	7,636	23,036
White adults with data on cardiovascular disease prevalence	7,492	7,906	7,632	23,030

*ineligible addresses were those where no private households were found

† at some addresses has more than one household was resident there

**defined as households where at least one adult completed a questionnaire