Related Variables
| cai4p | Central Apnea Index >= 4% - number of [central apneas with >= 4% oxygen desaturation] per hour of sleep | Polysomnography/Respiratory Events/Indexes | |
| rdi4p |
Overall RDI at 4% oxygen desaturation
Ratio of the count of all apneas (central and obstructive) and hypopneas associated with at least a 4% oxygen desaturation to the total sleep time expressed in hours |
Polysomnography/Respiratory Events/Indexes | |
| rdi4ps | Overall RDI (Supine) at 4% oxygen desaturation | Polysomnography/Respiratory Events/Indexes | |
| rdinr4p | Overall RDI (NREM) at 4% oxygen desaturation | Polysomnography/Respiratory Events/Indexes |