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Table 1 Participants in the Health Survey for England 1994, 1998 and 2003

From: Chronic exposure to outdoor air pollution and diagnosed cardiovascular disease: meta-analysis of three large cross-sectional surveys

  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
  1. *ineligible addresses were those where no private households were found
  2. † at some addresses has more than one household was resident there
  3. **defined as households where at least one adult completed a questionnaire