Figure 1. Receiver operator curves for the 758 high risk participants in predicting an REI ≥ 15 events/h for each of the screening questionnaires.

Stars represent the previously published cut points used in this study. All-Six represents the curve made by the six factors (age ≥ 50 years, male sex, body mass index ≥ 32 kg/m², neck circumference ≥ 40 cm, snoring ≥ 3 days per week, witnessed apnea ≥ 3 days per week). REI = respiratory event index.