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. 2017 Apr 10;12(4):e0175264. doi: 10.1371/journal.pone.0175264

Table 2. The vascular measurements in patients with ischemic events in posterior circulation.

	Patients with PICA-VA (n = 15)		Patients without PICA-VA (n = 65)	P value
	PICA	Contralateral
Vertebral artery	(n = 15)	(n = 15)	(n = 130)
Diameter of V2 (mm)	3.0 ± 0.5	3.9 ± 0.6 ^†	3.7 ± 0.7 ^‡
Diameter of V2 (mm)	(2.8,2.3–4.3)	(3.8,2.7–4.9)	(3.7,1.8–6.7)
Peak systolic of VA(mm/s)	360±179	490±213	440±166
Peak systolic of VA(mm/s)	(290,150–800)	(460,230–1100)	(420,60–1010)
End diastolic of VA(mm/s)	67±50	169±97^†	142±80^†
End diastolic of VA(mm/s)	(60,0–160)	(160,80–470)	(135,0–490)
Mean velocity of VA(mm/s)	164 ± 88	276 ± 129^*	241 ± 100^*
Mean velocity of VA(mm/s)	(137,70–373)	(267,132–684)	(243,40–616)
Pulsatility index of VA	1.9 ± 0.6	1.2 ± 0.4 ^†	1.3 ± 0.5 ^‡
Pulsatility index of VA	(1.7,1.1–3.0)	(1.1,0.7–2.1)	(1.2,0.4–3.0)
Basilar artery
BA diameter (mm)	2.5 ± 0.9		3.2 ± 0.5	0.004
BA diameter (mm)	(2.8,0.5–3.4)		(3.2,2.2–4.1)	0.004
Peak systolic of BA(mm/s)	832±494		757±419	0.326
Peak systolic of BA(mm/s)	(700,250–2250)		(620,280–2120)	0.326
End diastolic of BA(mm/s)	341±283		315±208	0.773
End diastolic of BA(mm/s)	(280,90–124)		(250,100–1020)	0.773
Mean velocity of BA(mm/s)	504 ± 350		462 ± 272	0.445
Mean velocity of BA(mm/s)	(402,143–1577)		(360,160–1313)	0.445
Pulsatility index of BA	1.1 ± 0.2		1.0 ± 0.3	0.349
Pulsatility index of BA	(1.1,0.6–1.4)		(1.0,0.4–1.7)	0.349
Posterior cerebral artery
PCA diameter (mm)	1.6 ± 0.1		2.0 ± 0.1	0.006
PCA diameter (mm)	(1.6,0.9–2.3)		(2.0,0.8–3.1)	0.006

PICA-VA, PICA termination of the VA

Data were expressed as mean±SD; (median, range) for continuous variables or percentage for discrete variables.

*: compare to PICA, p<0.01

†: compare to PICA, p<0.001

‡: compare to PICA, p<0.0001