CPAP results

[Nighty Night]

My CPAP results show my AI as .4 or .5 which confuses me. How can you have a fraction of an incident?

[OCNorsk]

I think that's an average over the period in question.

[onesight1]

AHI is gathered from the total time slept and the number of respiratory events you had.

throw in some math and you get the average/hour

[rested gal]

I think that's an average over the period in question.

Right. The AHI is not literally how many events (apneas and hypopneas) you had each and every hour. Nor is it a total of apneas and hypopneas for the night. It's an average per hour of how many apneas and hypopneas you had during that sleep time.

How to figure the AHI (Apnea/Hypopnea Index.)
Add together your apneas and hypopneas. Ignore the snores, flow limitations. Just add the apneas and hypopneas together. Divide that number by the total number of hours you slept.

Example:

3 apneas, 7 hypopneas = 10
Slept 6 hours (divide 10 by 6) = 1.6

The AHI for that night is 1.6

Derek explains how to figure AHI:
viewtopic.php?p=9427
If you go to that link, you'll see how math challenged I am!! Derek is an MIT professor.

Hey Rested One,
If you have a calculator, divide the number of minutes by 60 to give you the fraction of an hour, Using the example of 38 minutes -
38/60 = 0.633
so that if you slept for 7 hours 38 minutes that's 7.633 hours.