TABLE 2.

Exclusion criteria for the selection of healthy, nonsmoker Caucasian subjects in the Canadian Obstructive Lung Disease study (age range 40 to 90 years)

Criteria	Men (n=1234)		Women (n=1808)		Total (n=3042)
	Excluded	Remaining	Excluded	Remaining	Excluded	Remaining
Smoker or exsmoker	706	528	893	915	1599	1443
MD diagnosis of emphysema	2	526	6	909	8	1435
MD diagnosis of current asthma	43	483	107	802	150	1285
MD diagnosis of COPD	2	481	5	797	7	1278
MD diagnosis of tuberculosis	6	475	16	781	22	1256
MD diagnosis of current chronic bronchitis	2	473	6	775	8	1248
Non-Caucasian	67	406	151	624	218	1030
Unacceptable spirometry data	17	389	15	609	32	998
Hospitalized for breathing problems before 10 years of age	18	371	24	585	42	956
Cough for >3 months	22	349	39	546	61	895
Sputum for >3 months	7	342	16	530	23	872
Wheeze apart from colds	8	334	20	510	28	844

Data presented as n. COPD Chronic obstructive pulmonary disease; MD Physician