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Table 1 Categorisation and characteristics of subjects

From: Smoking, respiratory symptoms and likely asthma in young people: evidence from postal questionnaire surveys in the Wythenshawe Community Asthma Project (WYCAP)

  Group 1 Group 2 Group 3
Questionnaire(s) answered 1999 only 2001 only 1999 and 2001
Number of individuals 930 1000 1558
Age 16–24 34.2% 41.2% 21.1%
Age 25–34 35.8% 31.5% 34.1%
Age 35–44 30.0% 27.3% 44.9%
Female 53.2% 51.8% 56.3%
Never smokers 40.0% 39.1% 47.2%
ETS exposure 53.8% 52.7% 46.0%