Study ID number
Constituency/Ward
Macro spatial context
Forced expiatory volume in one second (liters)
Age in years
Sex 0: Female; 1: Male
Social class 1: I & II; 2: III Manual; 3: III Non-Manual; 4: IV & V; 5: Other
Categorical income 1: 2: Middle; 3: High; 4: Not Reported
Employment status 0: Employed, 1: Unemployed
Smoking status 0: Non-smoker; 1: Smoker; 9: Missing