Table 2.

Contingency table of the number of patients diagnosed with obstruction by conventional spirometry and by the COPD-6 in different two level of FEV1/FEV6

		Obstruction in COPD 6 (FEV1/FEV6)				Total
		<0.7		<0.72
		Yes	No	Yes	No
Obstruction in spirometer FEV1/FEVC	Yes	16	3	16	3	19 (15.6%)
	No	2	101	3	100	103 (84.4%)
	Total	18	104	19	103	122