Skip to main content
. Author manuscript; available in PMC: 2020 Feb 8.
Published in final edited form as: Lancet Respir Med. 2019 Jul 9;7(8):687–698. doi: 10.1016/S2213-2600(19)30198-5

Table 1:

Differences in hypopnea scoring rules between American Academy of Sleep Medicine guidelines19,22

Hypopnoea criteria
1999 guideline ≥50% decrease in flow OR a clear reduction in flow that does not reach ≥50% AND is associated with either an oxygen desaturation of ≥3% or an arousal
2007 guideline ≥30% decrease in flow from baseline with an associated oxygen desaturation of ≥4%
2012 guideline ≥30% decrease in flow from baseline with an associated oxygen desaturation of ≥3% OR an associated arousal