Effects of Continuous Positive Airway Pressure on Sleep EEG Characteristics in Patients with Primary Central Sleep Apnea Syndrome

Table 3

The data of FD and zDFD before and after continuous positive airway pressure (CPAP) treatment in patients with central sleep apnea syndrome (CSAS).

CSAS	NREM		REM
	Before CPAP	After CPAP	Before CPAP	After CPAP
FD	561.67 ± 44.19	438.67 ± 120.83	51.55 ± 31.02	132.81 ± 50.54
zDFD	0.31 ± 0.10	0.25 ± 0.60	0.28 ± 0.19	0.25 ± 0.12

vs. data before CPAP. FD, fractal dimension; zDFD, zero-crossing rate of detrended FD; CPAP, continuous positive airway pressure; CSAS, central sleep apnea syndrome.