. 2021 Jan 19;4(1):9. doi: 10.3390/mps4010009

Table 3.

2015 AASM Guidelines for the scoring of pediatric respiratory events [1].

Respiratory Event	Definition
Obstructive apnea	Drop in airflow by 90% of pre event baseline for ≥2 breaths associated with respiratory effort
Central apnea	Drop in airflow by 90% of pre-event baseline with absent inspiratory effort and event lasts ≥20 s or ≥2 breaths and associated with arousal or 3% oxygen desaturation.
Mixed apnea	Apnea for >2 breaths with periods of both absent and active respiratory effort, in either sequence.
Hypopnea	Drop in peak flow by ≥30% with either ≥3% oxygen desaturation or arousal for >2 breaths.
RERA	At least 2 breaths when the breathing sequence is characterized by increasing respiratory effort, flattening of the inspiratory portion of the nasal pressure flow waveform, snoring, or an elevation in the end-tidal PCO₂ leading to arousal from sleep when the sequence of breaths does not meet criteria for an apnea or hypopnea.
Hypoventilation	CO₂ > 50 mm Hg for >25% of total sleep time, measured by end-tidal CO₂ or CO₂ transcutaneous.