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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Epoch-by-epoch illustration of difference envelope parameter values and the manually scored respiratory events. The illustration represents a single patient whose manually determined apnea–hypopnea index was 58.6 events/h.