Table 3 Study population distribution across phenotype category

			COPD	No COPD	Total
Asthma*	Chronic bronchitis*	Emphysema*	6	1	7
		No emphysema	15	13	28
	No chronic bronchitis	Emphysema	9	2	11
		No emphysema	23	40	63
No asthma	Chronic bronchitis	Emphysema	6	0	6
		No emphysema	2	17	19
	No chronic bronchitis	Emphysema	10	8	18
		No emphysema	25	292	317
Total			96	373	469

COPD, chronic obstructive pulmonary disease (defined as post-bronchodilator FEV₁/FVC <0.7).
*See text for definitions of these phenotypes.