Table 1. Statistics of the experimental data set.

	All	Healthy	Mild	Moderate	Severe
Number	136	41	23	34	38
Ages	53.1 ± 5.1	47.8 ± 4.2	54.0 ± 4.1	54.6 ± 3.3	56.9 ± 3.0
BMI	26.9 ± 4.0	22.9 ± 2.2	24.8 ± 2.4	28.9 ± 2.4	30.8 ± 2.0
AHI	19.6 ± 15.4	2.4 ± 1.3	11.1 ± 4.4	23.9 ± 2.8	39.5 ± 7.1