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. 2018 May 3;144(6):513–518. doi: 10.1001/jamaoto.2018.0347

Figure 1. Patient Selection Flowchart.

Figure 1.

Abbreviations: AHI, apnea-hypopnea index; BMI, body mass index (calculated as weight in kilograms divided by height in meters squared); OSA, obstructive sleep apnea; PSG, polysomnogram.

aPatients were identified by first searching the Sleep Disorders Database for all patients who underwent a PSG since 2010. There were 1012 patients with a PSG and a high-resolution computed tomographic (CT) scan of the head available for measurements. From these patients, 2 cohorts were isolated: A non-OSA cohort consisting of 82 patients, and a severe OSA cohort consisting of 92 patients.

bCalculated as weight in kilograms divided by height in meters squared.