Retrospective Cohort Angiographic Analysis of Vertebral Artery Dominance, Stenosis Patterns, and Demographic Correlations

Figures & data

Table 1 Demographic Characteristics of Patients by Gender

Gender	Total Patients	Mean Age (Years)	Standard Deviation (Years)
Male	118	60.7	13.2
Female	64	62.6	11.5

Table 2 Distribution of Vertebral Artery Stenosis Severity in Study Participants

Severity of Stenosis	Frequency	Percent
Mild stenosis	48	26.4
Moderate stenosis	80	44.0
Severe stenosis	54	29.7
Total	182	100.0

Figure 1 The distribution of the major risk factors of VA stenosis.

Table 3 Distribution of Vertebral Artery Dominance and Affected Side in Study Participants

Dominant Side	Affected Side			Total
	Bilateral	Left	Right
Codominant	1	43	32	76
Left	1	31	41	73
Right	0	22	11	33
Total	2	96	84	182

Table 4 Chi-Square Test Results for Comparison of Vertebral Stenosis Distribution Between Left and Right Sides

	Value	df	Asymptotic Significance (2-Sided)
Pearson Chi-Square	13.951^a	6	0.03
Likelihood Ratio	15.087	6	0.02
N of Valid Cases	182

Notes: ^a4 cells (33.3%) have expected count less than 5. The minimum expected count is 0.27.

Table 5 Cross Tabulation of Vertebral Artery Dominance and Degree of Stenosis in Study Participants

			Dominant side			Total
			Codominant	Left	Right
Degree of VA stenosis	Mild	Count	23	18	7	48
		% of Total	12.6%	9.9%	3.8%	26.4%
	Moderate	Count	44	28	8	80
		% of Total	24.2%	15.4%	4.4%	44.0%
	Sever	Count	9	27	18	54
		% of Total	4.9%	14.8%	9.9%	29.7%
Total		Count	76	73	33	182
		% of Total	41.8%	40.1%	18.1%	100.0%

Figure 2 Frequency and percentage of VA dominancy.

Table 6 Association Between Atherosclerotic Risk Factors and Vertebral Artery Stenosis

Atherosclerotic Risk Factors	The Calculated Chi-Square Value with 2 Degrees of Freedom	The p-values < 0.05
Hyperlipidemia	12.147	0.002
Smoking	6.275	0.043
Hypertension (HTN)	6.786	0.034
Diabetes Mellitus (DM)	1.828	0.401