Upper airway size analysis in obstructive sleep apnea

Segmental analysis-percent airway centerline length versus (A) mean airway cross-sectional area, (B) minimal cross-sectional area, and (C) volume. Data points represent mean values ±SD along 10 percent segments. Dotted lines represent estimated measurements between data points. Solid blue circles = subjects with obstructive sleep apnea; open red circles = control subjects. Regions of the adenoid and tonsils adjacent to the airway are shown by horizontal bars. Note the overlap regions for tonsils and adenoid.