Table 3.

Comparison of blood flow change of vertebrobasilar artery between two groups in TCD examination ($\overline{\mathrm{x}}$ ± s, v/cms⁻¹)

Group	Artery	Side	Vs	Vd	Vm	PI	RI
Observation group (n = 80)	BA		44.52 ± 5.53a	24.38 ± 8.39a	32.46 ± 9.46a	0.73 ± 0.12a	0.67 ± 0.12a
	VA	Left	33.63 ± 10.09a	20.30 ± 6.69a	24.36 ± 7.38a	0.79 ± 0.12a	0.65 ± 0.07a
		Right	33.95 ± 11.02a	18.06 ± 6.45a	25.18 ± 8.36a	0.77 ± 0.13a	0.66 ± 0.16a
Control group (n = 80)	BA		53.92 ± 9.86	27.56 ± 8.95	36.46 ± 8.46	0.70 ± 0.08	0.62 ± 0.05
	VA	Left	45.36 ± 9.34	20.33 ± 7.63	30.14 ± 7.46	0.71 ± 0.09	0.58 ± 0.06
		Right	43.26 ± 9.78	22.36 ± 7.56	28.60 ± 7.08	0.71 ± 0.11	0.56 ± 0.03

Notes: compared with the control group, ^aP<0.05