Blood and cerebrospinal fluid flow oscillations measured with real-time phase-contrast MRI: breathing mode matters

Table 2 Normalized powers in the respiratory (R) and cardiac (HR_1-2–3) bands, for Internal Carotid Artery (ICA), Internal Jugular vein (IJV), and cerebrospinal fluid (CSF)

	Region of interest	F	PN	PD	F vs PN	F vs PD	PN vs PD
Respiratory band (R)	ICA	0.01 [0.01–0.07]	0.03 [0.01–0.11]	0.07 [0.02–0.44]	< 0.001	< 0.001	< 0.001
	IJV	0.06 [0.01–0.52]	0.10 [0.01–0.49]	0.31 [0.04–0.74]#	< 0.001	< 0.001	< 0.001
	CSF	0.02 [0.01–0.17]	0.05 [0.01–0.28]	0.13 [0.02–0.42]	< 0.001	< 0.001	< 0.001
Cardiac band HR_1-2–3	ICA	0.84 [0.63–0.92]	0.81 [0.56–0.91]	0.67 [0.35–0.84]	0.489	< 0.001	0.002
	IJV	0.77 [0.25–0.91]	0.63 [0.13–0.88]	0.30 [0.1–0.87]#	< 0.001	< 0.001	< 0.001
	CSF	0.90 [0.78–0.96]	0.87 [0.67–0.93]	0.72 [0.47–0.9]	0.019	< 0.001	< 0.001

Median [range] values are provided. Free (F), paced normal (PN), paced and deep (PD) breathing are compared, and the Bonferroni-corrected p-values of the paired comparisons are reported. The comparisons between the two bands were all significant with p < 0.001, with the exception of #p = 1

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