Table 4 Comparison of the observed vs. predicted α, Φ₁ and Φ₂ angles in the patient groups

L ICA

114.8 ± 15.4 vs. 54.6 ± 24.9*

L ICA

120.7 ± 26.4 vs. 61.4 ± 19.3*

L ICA

119.1 ± 14.7 vs. 60.7 ± 24.9*

MCA bifs w/ An

128.2 ± 24.2 vs. 62.2 ± 23.3*

R MCA

103.4 ± 25.8 vs. 66.6 ± 16.2**

R MCA

97.1 ± 20.5 vs. 71.2 ± 20.3*

MCA bifs w/o An

105.9 ± 19.1 vs. 68.3 ± 24.9*

L MCA

93.3 ± 18.0 vs. 64.3 ± 25.8*

L MCA

93.2 ± 19.6 vs. 67.9 ± 26.3*

BA

107.4 ± 19.3 vs. 48.5 ± 24.5*

BA

136.7 ± 23.0 vs. 52.9 ± 22.6**

BA

107.0 ± 23.6 vs. 63.0 ± 19.0*

Φ₁ angle (^o)

R ICA

44.9 ± 31.3 vs. 22.0 ± 8.3*

R ICA

35.6 ± 16.8 vs. 21.2 ± 10.6***

R ICA

41.7 ± 20.4 vs. 22.9 ± 10.2*

L ICA

39.9 ± 30.3 vs. 19.3 ± 9.7*

L ICA

45.6 ± 19.2 vs. 22.9 ± 6.9**

L ICA

40.4 ± 20.6 vs. 21.5 ± 9.9*

MCA bifs w/ An

59.6 ± 25.2 vs. 23.0 ± 10.4*

R MCA

47.7 ± 22.9 vs. 24.0 ± 7.9**

R MCA

46.8 ± 23.1 vs. 23.8 ± 9.2*

MCA bifs w/o An

47.3 ± 20.9 vs. 24.3 ± 10.1*

L MCA

49.9 ± 27.0 vs. 25.0 ± 12.4*

L MCA

42.4 ± 23.0 vs. 23.3 ± 10.0*

BA

54.6 ± 20.2 vs. 19.2 ± 9.7*

BA

71.7 ± 18.9 vs. 18.7 ± 7.7**

BA

55.7 ± 19.2 vs. 25.6 ± 9.5*

Φ₂ angle (^o)

R ICA

88.2 ± 28.2 vs. 37.5 ± 16.4*

R ICA

96.0 ± 13.8 vs. 37.7 ± 17.8*

R ICA

95.0 ± 17.4 vs. 39.3 ± 17.6*

L ICA

86.8 ± 27.4 vs. 35.3 ± 17.1*

L ICA

93.2 ± 15.6 vs. 38.5 ± 15.3*

L ICA

92.5 ± 19.1 vs. 39.2 ± 19.3*

MCA bifs w/ An

81.5 ± 21.7 vs. 39.2 ± 16.3*

R MCA

66.4 ± 20.5 vs. 42.6 ± 11.9**

R MCA

61.0 ± 19.4 vs. 47.4 ± 16.3*

MCA bifs w/o An

68.2 ± 20.4 vs. 44.0 ± 19.8*

L MCA

57.8 ± 25.2 vs. 39.3 ± 14.3***

L MCA

65.3 ± 18.2 vs. 44.7 ± 21.4*

BA

60.5 ± 17.9 vs. 29.2 ± 16.8*

BA

77.1 ± 24.0 vs. 34.3 ± 15.9**

BA

58.2 ± 20.8 vs. 37.4 ± 14.0*