Respiratory Disturbance Index at 3% oxygen desaturation. Ratio of the count of all apneas (central and obstructive) and hypopneas associated with at least a 3% oxygen desaturation to the total sleep time expressed in hours. [(Total number of apneas and hypopneas associated with >= 3% oxygen desaturation) / (hours of sleep)]

Supine RDI at 3% oxygen desaturation [(Total number of apneas and hypopneas in supine body position associated with >= 3% oxygen desaturation) / (hours of sleep)]

REM RDI at 3% oxygen desaturation [(Total number of apneas and hypopneas in REM sleep associated with >= 3% oxygen desaturation) / (hours of REM sleep)]