Table 2.

Definitions of the parameters used in this study

Parameter	Description	Definition
Apnea-hypopnea index (1/h)	The number of apnea and hypopnea events per hour	$\frac{n_{\mathrm{a}\mathrm{p}\mathrm{n}\mathrm{e}\mathrm{a}\mathrm{e}\mathrm{v}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{s}}+n_{\mathrm{h}\mathrm{y}\mathrm{p}\mathrm{o}\mathrm{p}\mathrm{n}\mathrm{e}\mathrm{a}\mathrm{e}\mathrm{v}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{s}}}{t_{\mathrm{a}\mathrm{n}\mathrm{a}\mathrm{l}\mathrm{y}\mathrm{z}\mathrm{e}\mathrm{d}}}$
Oxygen desaturation index (1/h)	The number of desaturation events per hour	$\frac{n_{\text{desaturation events}}}{t_{\text{analyzed}}}$
Apnea duration (s)	The duration of an apnea event
Hypopnea duration (s)	The duration of a hypopnea event
Desaturation duration (s)	The duration of a desaturation event
Apnea proportion (%)	The proportion of apnea events out of all obstructive events	$\frac{n_{\mathrm{a}\mathrm{p}\mathrm{n}\mathrm{e}\mathrm{a}\mathrm{e}\mathrm{v}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{s}}}{n_{\mathrm{a}\mathrm{p}\mathrm{n}\mathrm{e}\mathrm{a}\mathrm{e}\mathrm{v}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{s}}+n_{\mathrm{h}\mathrm{y}\mathrm{p}\mathrm{o}\mathrm{p}\mathrm{n}\mathrm{e}\mathrm{a}\mathrm{e}\mathrm{v}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{s}}}$

n_{apnea events}, n_{hypopnea events,} and n_{desaturation events} denote the number of scored apnea, hypopnea, and desaturation events during the analyzed time. t_analyzed denotes the total analyzed time