Table 1.

Distribution of means (M) and standard deviation (SD) before treatment (T0), after 6 months (T1), and 48 months (T2) of treatment.

	T0		T1		T2		Statistical analysis
	Mean	SD	Mean	SD	Mean	SD	T0-T1	T0–T2	T1-T2
BMI (body mass index)	25,8	1,7	26,3	2,2	25,5	1,4	NS	NS	∗
ESS (Epworth Sleepiness Scale)	7,5	2,9	4,6	1,9	6,5	2,9	∗∗	NS	∗
AHI (apnea/ hypopnea index)	12,4	3,6	9,5	3,6	10,4	2,1	∗	∗	NS

^*0,05.

^**0,01.

^***0,001.

NS = not significant.