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Hypopnea Index (NREM, Non-Supine) : (Hypopneas with > 50% flow reduction and with >= 5% oxygen desaturation or with arousal) / hour of NREM sleep in non-supine position from type I polysomnography
under Sleep Monitoring/Polysomnography/Apnea-Hypopnea Indices in
Calculated - Summary metric of sleep disordered breathing events.
National Sleep Research Resource
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