Table 1.

Definitions of abbreviations used.

Abbreviation	Definitions
H3A	Recommended hypopnea definition based on a ≥ 30% reduction in airflow for ≥ 10 seconds associated with a ≥ 3% decrease in the oxygen saturation or an arousal
AHI3A*	AHI based on H3A
H4†	Acceptable hypopnea definition based on a ≥ 30% reduction in airflow for ≥ 10 seconds associated with a ≥ 4% decrease in the oxygen saturation
AHI4*	AHI based on H4
H4nOSA	Individuals meeting AHI criteria for diagnosis of OSA using H3A but not H4

*Apnea (as defined by AASM Scoring Manual ²): ≥ 90% reduction in airflow for ≥ 10 seconds. †Definition utilized by Centers for Medicare & Medicaid Services. AHI = apnea-hypopnea index, OSA = obstructive sleep apnea.