Table 3 Morphologic features of vertebrobasilar arteries on VWI and PCI occurrence (n = 249 patients).

Morphology (%)

Tuning fork

31 (34.1)

60 (65.9)

2.009

0.366^{a, *}

Walking

31 (44.9)

38 (55.1)

Lambda

36 (40.4)

53 (59.6)

VAH (%)

+

29 (39.2)

45 (60.8)

0.001

0.972^a,#

–

69 (39.4)

106 (60.6)

Diameter (mm)

BA, M (Q25, Q75)

3.15 (2.85,3.88)

3.15 (2.80, 3.60)

6738.5

0.234^b

RVA, mean ± SD

3.56 \(\:\pm\:\:\)0.97

3.34\(\:\:\pm\:\) 0.84

1.877

0.062^c

LVA, mean ± SD

4.11\(\:\:\pm\:\) 0.99

3.78\(\:\:\pm\:\:\)0.76

2.951

0.003^c

Mean of bi-VAs, mean ± SD

3.83 \(\:\pm\:\:\)0.71

3.56 \(\:\pm\:\:\)0.57

3.355

< 0.001^c

Difference of bi-VAs, M (Q25, Q75)

0.70 (0.25, 1.61)

0.45 (0.15, 1.2)

6194.5

0.030^b

Vessel area (mm²)

BA, M (Q25, Q75)

20.58 (16.11, 26.63)

20.79 (16.74, 25.50)

1822.5

0.848^b

RVA, M (Q25, Q75)

25.05 (20.78, 32.24)

23.59 (17.92, 28.47)

1692.5

0.476^b

LVA, M (Q25, Q75)

27.42 (20.49, 33.28)

25.05 (20.78, 32.24)

1618.0

0.215^b

Lumen area (mm²)

BA, mean ± SD

7.73 \(\:\pm\:\:\)3.24

7.31 \(\:\pm\:\:\)3.29

0.771

0.442^c

RVA, mean ± SD

7.33\(\:\:\pm\:\:\)3.67

6.99\(\:\:\pm\:\) 4.17

0.704

0.482^c

LVA, mean ± SD

6.89\(\:\:\pm\:\) 4.21

6.46 \(\:\pm\:\:\)3.27

0.788

0.431^c

RI

BA, M (Q25, Q75)

1.02 (0.84, 1.20)

1.07 (0.89,1.32)

3360.0

0.167^b

RVA, M (Q25, Q75)

1.19 (1.04, 1.41)

1.19 (1.00,1.48)

3821.5

0.873^b

LVA, M (Q25, Q75)

1.25 (1.06, 1.56)

1.27 (1.04,1.62)

3382.0

0.190^b

Tortuosity

BA-midline (mm), M (Q25, Q75)

6.10 (3.15, 9.21)

5.30 (2.50,8.00)

6343.0

0.057^b

Tortuosity index, M (P25, P75)

BA

1.06 (1.02, 1.13)

1.06 (1.02,1.12)

7365.0

0.951^b

RVA

1.08 (1.02, 1.14)

1.09 (1.04,1.17)

5672.0

0.002^b

LVA

1.06 (1.02, 1.11)

1.08 (1.03,1.17)

6734.5

0.231^b

Lateral position of BA, grade, n (%)

0

28 (28.6)

61 (40.4)

6245.0

0.028^b

1

34 (34.6)

51 (33.8)

2

32 (32.7)

36 (23.8)

3

4 (4.1)

3 (2.0)

Height of the BA bifurcation, grade, n (%)

0

28 (28.6)

61 (40.4)

6398.0

0.056^a

1

40 (40.8)

51 (33.8)

2

22 (22.4)

38 (25.2)

3

8 (8.2)

1 (0.6)

Length (mm)

BA, mean ± SD

26.74\(\:\:\pm\:\:\)4.27

26.18 \(\:\pm\:\:\)4.35

0.997

0.320^c

RVA, mean ± SD

39.07\(\:\:\pm\:\) 6.95

39.07\(\:\:\pm\:\) 6.34

0.007

0.995^c

LVA, mean ± SD

40.92 \(\:\pm\:\:\)6.57

40.61\(\:\:\pm\:\:\)6.71

0.358

0.721^c

Angle (\(\:^\circ\:\))

VAJ, mean ± SD

55.75\(\:\:\pm\:\:\)22.46

58.73\(\:\:\pm\:\) 25.28

0.948

0.344^c

VBJR, mean ± SD

153.29 \(\:\pm\:\:\)34.81

150.82\(\:\:\pm\:\) 31.27

0.581

0.562^c

VBJL, mean ± SD

150.96\(\:\:\pm\:\) 37.05

150.45 \(\:\pm\:\:\)38.30

0.104

0.917^c