Fig. 3From: Receiver operating characteristics of impulse oscillometry parameters for predicting obstructive sleep apnea in preobese and obese snorers(a) ROC curves of the IOS parameters obtained in 93 patients suffering from OSAS and 121 non-OSAS patients in seated positions. The area under the ROC curve is a measure of the global ability of IOS parameter to correctly classify patients without and with OSAS (RDI < 15 or ⩾15/h). The value of the area under the ROC curve, respectively, for Rrs0 was 0.668 (95 % CI 0.596 to 0.740), for Zrs5 was 0.660 (95 % CI 0.587 to 0.732), R5 was 0.653 (95 % CI 0.580 to 0.727), BMI was 0.660 (95 % CI 0.588 to 0.733), Grs0 was 0.669 (95 % CI 0.596 to 0.741), Gz was 0.659 (95 % CI 0.587 to 0.732) and for X5 was 0.723 (95 % CI 0.655 to 0.792). (b) ROC curves of the IOS parameters obtained from all patients with and without OSAS in the supine position. The area under the ROC curve is a measure of the ability of IOS parameters to correctly classify patients of (RDI < 15 or ⩾15/h). The value of the area under the ROC curve for IOS parameters in the supine position, respectively, for Rrs0 was 0.772 (95 % CI 0.709 to 0.834), for Zrs was 0.754 (95 % CI 0.689 to 0.819), R5 was 0.743 (95 % CI 0.677 to 0.809), Grs was 0.772 (95 % CI 0.709 to 0.834), Gz was 0.754 (95 % CI 0.689 to 0.834) and for X5 was 0.811 (95 % CI 0.752 to 0.870)Back to article page