Table 6.

Mean P300 amplitudes (µV) of healthy controls, OSAS-low hypoxemia subgroup and OSAS-high hypoxemia subgroup at F_z, C_z and P_z electrode sites

Electrode	Healthy controls (n = 34)	OSAS-low hypoxemia (n = 24)	OSAS-high hypoxemia (n = 30)	p
Fz	3.89 ± 1.63	2.07 ± 1.63	2.00 ± 1.75	<.001a,b
Cz	4.03 ± 1.50	2.10 ± 1.82	1.86 ± 1.89	<.001a,b
Pz	3.69 ± 1.48	2.41 ± 1.73	1.83 ± 1.71	<.001a,b

Data are presented as mean ± standard deviation (SD)

OSAS obstructive sleep apnea syndrome, µV microvolt

Significant differences between groups were symbolized with: ^aHealthy controls versus OSAS low hypoxemia, ^bHealthy controls versus OSAS high hypoxemia