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Blue line shows the receiver operating characteristic curve for (A) therapeutic PAP level, (B) body mass index, and (C) AHI as predictors of HGNS response. Response defined as AHI reduction > 50% and AHI < 20 events/h. Red line shows the null hypothesis. AHI = apnea-hypopnea index, HGNS = hypoglossal nerve stimulation, PAP = positive airway pressure.
