Table 5.

Comparisons of angle in the four geometric configurations.

	Walking (N = 26)	Tuning Fork (N = 11)	Lambda (N = 40)	No Confluence (N = 9)	P
AP-mid-BA angle (°)	36.13 ± 18.27	14.95 ± 11.66	24.84 ± 13.02	24.17 ± 10.54	*0.001a
VA-BA angle (°)	31.05 (13.7–42.98)	17.9 (11.6–28.6)	24.7 (18.4–37.88)	24.9 (18.95–33.4)	#0.362
Lateral-mid-BA angle (°)	25.40 ± 14.45	22.35 ± 10.3	21.6 ± 14.63	23.26 ± 8.5	*0.739

Values are presented as mean ± standard deviation, or median (interquartile range).

^*Comparisons were performed by variance analysis.

^#Comparison was performed by the Wallies H test.

AP, anteroposterior; VA, vertebral artery; BA, basilar artery.

^aWalking vs. Tuning Fork, P < 0.001; Walking vs. Lambda, P = 0.003; Walking vs. No Confluence, P = 0.036; Tuning Fork vs. Lambda, P = 0.048; Tuning Fork vs. No Confluence, P = 0.160; Lambda vs. No Confluence, P = 0.900.