Figure 1. ROC curves for diagnosing SDB using ODI measured by HRPO (true diagnosis of SDB is defined by 5 REI thresholds [ ≥ 5, ≥ 10, ≥ 15, ≥ 20, ≥ 30 events/h]).

HRPO = high resolution pulse oximetry, ODI = oxygen desaturation index, REI = repiratory event index, ROC = receiver operating characteristic, SDB = sleep-disordered breathing.