Table 3: Data for dominant sides in the three types of the vertebral artery with comparison of affected and nonaffected sides.

Affected side
Type IType IIType III

Non-affected sideType I11 (2)7 (3)17 (1)
Type II6 (0)1 (0)0 (0)
Type III11 (3)2 (1)0 (0)
None1 (0)0 (0)1 (0)

Total29 (5)10 (4)18 (1)

( ): affected side is nondominant.