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. Author manuscript; available in PMC: 2014 Aug 22.
Published in final edited form as: Lancet. 2013 Aug 2;383(9918):736–747. doi: 10.1016/S0140-6736(13)60734-5

Table 2.

Adult respiratory event scoring

Definition
Apnoea Airflow reduced to less than 10% of baseline for more than 10 s; obstructive if respiratory effort is present, central if no respiratory effort is present
Hypopnoea (recommended definition) Airflow reduced to less than 30% of baseline for more than 10 s, in association with a 4% oxygen desaturation
Hypopnoea (alternative definition) Airflow reduced to less than 50% of baseline for more than 10 s, in association with a 3% oxygen desaturation or an arousal from sleep
Respiratory effort related arousal Sequence of breaths lasting more than 10 s that do not meet the standard hypopnoea definition but that are characterised by high upper-airway resistance (snoring and flattened inspiratory nasal pressure signal) and that terminate in arousal from sleep

According to AASM scoring manual.