Apple Watch: Breathing Disturbance Value

Can’t find any details on what the exact definition of Breathing Distrubance Value mean in the sleep apnea alert function on Apple Watch. What do the values mean and what are they measuring exactly. Are the a universally recognized measurement that my doctor would understand or just some measurement unique to Apple’s way of measuring for sleep apnea. Is it an estimate of AHI and is the number result similar to what an AHI result would be? (Ie 13, 23, 30) etc.

Would be nice to understand if this measurement at 20 vs 50 indicates that you stopped breathing X times vs Y times, etc. I’ve read through all the material I could find authored by Apple and even searched the web for any third party explanation and have found nothing.

Anyone that knows the answer please reply.

Thank you,