Table 1. Demographic and clinical data.

	Control Subjects	t-OSAS	OSAS
Number of subjects	20	20	20
Women/men	3/17	1/19	5/15
Age [years]	75.06 ± 0.9	75.27 ± 0.9	75.6 ± 0.9
BMI [kg/m²]	27.61 ± 2.8	28.61 ± 3.5	29.37 ± 3.4
Neck circumference [cm]	37.47 ± 3.7	40.92 ± 3.5	40.1 ± 4.2
ESS	4.6 ± 3.4	8.6 ± 3.8	6.5 ± 3.6
AHI [n/h]	6.79 ± 3.6	50.1 ± 16.2	30.75 ± 18.8
ODI [n/h]	0.9 ±0.8	31.6 ±10.3	17.9 ±7.0

Data are given as mean ± standard deviation. Abbreviations: OSAS, obstructive sleep apnea syndrome; t-OSAS, obstructive sleep apnea syndrome treated with continuous positive airway pressure; BMI, Body Mass Index; ESS, Epworth Sleepiness Scale evaluation; AHI, apnea plus hypopnea index; ODI, Oxyhemoglobin Desaturation Index. For t-OSAS subjects, baseline ESS, AHI and ODI are given.