Outcome	Adjusted for	Result
FEV1, symptoms		Association between SES and FEV1 but not symptoms
FEV1	Smoking, sex	22.3/7.2% in low/high quintile SES had poor FEV1 (p<0.001)
FEV1, symptoms	Smoking	Weak associations with both symptoms and FEV1
FEV1, symptoms	Smoking	All indices of SES were associated with both symptoms and FEV1
FEV1	Smoking	FEV1 reduced 10 ml per year without central heating
FEV1, symptoms	Smoking, occupation	Inconsistent associations
FEV1, FVC, symptoms	Smoking	200–300 ml difference in FEV1, symptoms associated with SES
FEV1, FVC, symptoms	Smoking, occupation	Significant association with FEV1 and some symptoms
FEV1, FVC, symptoms	Smoking, sex, occupational exposure	COPD OR 4.2 Spirometric airflow limitation OR 6.3
FEV1, quintile	Not adjusted	15/26% of low SES in low/high quintile of FEV1
FEV1, hospital admission	Smoking	300–400 ml difference in FEV1, hospital admission RR 3
Cause-specific mortality	Unadjusted	Chronic bronchitis RR 7.3; other respiratory RR 3.1
Chronic bronchitis		Income associated with chronic bronchitis
FEV1, FVC	Multiple	Boys FEV1 and FVC 8% lower, girls no difference