. 2018 Feb 23;13(2):e0192789. doi: 10.1371/journal.pone.0192789

Table 3. Contingency table of the number of subjects diagnosed with obstruction by conventional spirometer and using the Air Smart Spirometer device.

	AirSmart-Spirometer obstruction^a		Total
	NO	YES
Conventional spirometry obstruction ^a
NO	114	3	117
YES	8	75	83
Total	122	78	200

^(a) Defined by FEV1/FVC < .07