Table 4.

Differences in E/I MF among recording points in asthmatic subjects

ROC		Anterior chest		Posterior upper		Posterior lower
		Right	Left	Right	Left	Right	Left
AUC		0.82	0.77	0.81	0.67	0.76	0.75	–
(Sensitivity, specificity)		(0.81, 0.70)	(0.73, 0.75)	(0.82, 0.80)	(0.59, 0.65)	(0.64, 0.75)	(0.68, 0.70)	–
Cutoff		0.51	0.50	0.50	0.50	0.40	0.47	–
FeNO	Subject number							V50%pred <80%
<38 ppb	1	0.57	0.30	0.94	0.27	0.60	0.37	–
	2	0.73	0.71	0.79	0.84	0.60	0.58	Yes
	3	0.58	0.58	0.51	0.42	0.38	0.54	–
	4	0.43	0.20	0.35	0.27	0.22	0.29	–
	5	0.41	0.43	0.54	0.44	0.50	0.61	–
	6	0.61	0.51	0.58	0.55	0.39	0.44	Yes
	7	0.50	0.31	0.32	0.32	0.25	0.35	–
38–69 ppb	8	0.71	0.94	0.66	0.71	0.95	0.69	Yes
	9	0.44	0.23	0.48	0.22	0.35	0.25	–
	10	0.63	0.37	0.40	0.45	0.34	0.35	–
	11	0.67	0.59	0.56	0.51	0.67	0.69	Yes
	12	0.63	ND	0.59	0.34	0.34	0.33	–
≥70 ppb	13	ND	0.61	1.05	0.86	0.87	0.69	Yes
	14	0.62	0.56	0.66	0.44	0.46	0.47	Yes
	15	1.26	0.89	0.93	0.75	0.55	0.55	Yes
	16	0.70	0.78	0.50	0.50	0.37	0.33	Yes
	17	0.72	0.66	0.62	0.53	0.59	0.72	Yes
	18	0.89	0.68	0.70	0.81	0.70	0.78	Yes
	19	0.53	0.46	0.51	0.64	0.58	0.69	Yes
	20	0.91	0.66	0.77	0.71	0.49	0.69	Yes
	21	0.68	0.66	0.78	0.85	0.69	0.84	Yes
	22	0.58	0.55	0.59	0.59	0.40	0.48	–

Note: Bold values are greater than the cutoff value.

Abbreviations: %pred, %predicted; ROC, receiver operating characteristic; AUC, area under the curve; E/I, expiration-to-inspiration sound pressure ratio; MF, mid frequency; FeNO, fractional exhaled nitric oxide concentration; ND, not done.