Table 6.

Group averaged (n = 22) apparent diameter, VF, count, and rCNR of PVSVs in the thalamus, BG, midbrain, and WM during air and carbogen breathing. In the four rows for each parameter, the first and second rows are the mean (standard deviation) values under air and carbogen breathing conditions, respectively. The third row gives the percent difference between carbogen and air. The fourth row gives the FDR corrected p values from the Wilcoxon’s signed rank test of the null hypothesis that there is no difference in the PVSV parameter between the two gas conditions.

		Thalamus	BG	Midbrain	WM
Apparent diameter	Air	0.72 (0.08)	0.87 (0.04)	0.74 (0.10)	0.75 (0.04)
	Carbogen	0.73 (0.08)	0.88 (0.06)	0.75 (0.09)	0.76 (0.04)
	% difference	1.9 (7.2)	0.92 (4.1)	2.9 (18)	1.6 (2.4)
	Corrected p	0.45	0.45	0.59	0.0058
VF	Air	0.14 (0.13)	1.2 (0.44)	0.16 (0.11)	0.78 (0.4)
	Carbogen	0.14 (0.13)	1.2 (0.48)	0.17 (0.12)	0.85 (0.4)
	% difference	15 (32)	5.3 (9.9)	180 (830)	9.5 (11)
	Corrected p	0.15	0.0033	0.9	0.0033
Count	Air	12(7)	66 (15)	6.3 (3.6)	699 (235)
	Carbogen	12 (6)	68 (15)	6.7 (3.2)	732 (234)
	% difference	8 (30)	4 (9)	43 (60)	6 (11)
	Corrected p	0.62	0.15	0.62	0.15
rCNR	Air	27 (4)	33 (3)	36 (5)	26 (3)
	Carbogen	29 (5)	34 (4)	38 (7)	27 (3)
	% difference	7.1 (8.8)	4.6 (4)	4.1 (10)	3.5 (3.2)
	Corrected p	0.0011	0.00017	0.085	0.00024