Figure 4From: Upper airway dynamics during negative expiratory pressure in apneic and non-apneic awake snorersRelationship between AHI and V,NEP0.5 in the supine position during NEP (-5 cmH2O) in OSAH patients (white circles = mild-to-moderate OSAH; black circles = severe OSAH). The regression line refers only to severe OSAH patients. Back to article page