Table 3. Spearman’s rank correlation coefficient between amyloid beta 1–40 (Aβ 1–40) and polygraphic parameters (abbreviations explanations in the “Methods” section).

Pair of variables		R Spearman coefficient	p
Aβ 1–40	AHI (h-1)	0.45	<0.05
Aβ 1–40	AI (h-1)	0.43	<0.05
Aβ 1–40	HI (h-1)	0.28	<0.05
Aβ 1–40	RDT (min)	0.48	<0.05
Aβ 1–40	RDTI (min/h)	0.49	<0.05
Aβ 1–40	Mean SpO2 (%)	-0.28	<0.05
Aβ 1–40	Minimal SpO2 (%)	-0.47	<0.05
Aβ 1–40	t90 (%)	0.41	<0.05
Aβ 1–40	ODI (h-1)	0.46	<0.05