Calculated variables and Reports

These are the measurements of your sleep, the relative times spent in each sleep stage and how long you took to fall asleep: (only in Level 1 and 2 studies) :

Time available for sleep – i.e. when the lights were off.

Total sleep time.

Sleep efficiency – this is the percentage of time spent asleep during the time that the lights were off.

Sleep latency – the time taken to fall asleep.

REM sleep time.

NREM sleep time.

Sleep in supine position – time spent sleeping on your back.

These are your apnea measurements(in all studies) :

Total AHI (Apnea Hypopnea Index) – the average number of times per hour, you experienced an apnea or hypopnea event (total or >50% breathing cessation for 10 seconds or more).

Minimum oxygen saturation – the lowest level of oxygen detected in your blood.

Mean apnea/hypopnea duration – the average time in seconds of each episode.

Arousal index – the number of times per hour you aroused from sleep.

Apneas experienced in different positions.

RDI - The respiratory-disturbance index (RDI) reports on respiratory events during sleep like the apnea-hypopnea index. But it includes not only apneas and hypopneas, but also other, more subtle, breathing irregularities. This means a person's RDI can be higher than his or her AHI.

ODI - The oxygen-desaturation index (ODI) attempts to calculate the number of apnea or hypopnea events per hour that lead to an oxygen drop of at least 3%. This is thought to be important in assessing the risk of long-term cardiovascular (high blood pressure, heart attack, and heart failure) or neurocognitive (stroke and dementia) consequences.

Conclusion& Sleep Apnea Severity

The test identifies if you have sleep apnea and its relative severity:

Normal: AHI = 0-5. This will sometimes just be called “primary snoring”.

Mild obstructive sleep apnea: AHI = 5-15

Moderate obstructive sleep apnea: AHI = 15-30

Severe obstructive sleep apnea: AHI = 30+