Figure 3.

The receiver-operating characteristics (ROC) curves are shown for V,NEP_0.5 values during NEP (-5 cmH₂O) both in supine (continuous line) and seated (dashed line) position in 34 patients with OSAH and 21 subjects without OSAH. The area under the ROC curves reflects the ability of V,NEP_0.5 to distinguish subjects without and with OSAH (AHI>5).