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TABLE 1: Clinical backgrounds, symptoms, and risk factors in posterior circulation ischemia and control groups
PCI Group Control Group P
Clinical Backgrounds
N (male vs female) 21 (10:11) 16 (11:5) NS^†
Age range, y (mean) 41–80 (61.3) 40–85 (61.6) NS^*
Body mass index,kg/m² 24.8 ± 4.0 22.7 ± 3.9 NS^*
SBP, mm Hg 
 Intermittent 135.0 ± 18.1 NS^*
 Attack 148.6 ± 19.6 132.3 ± 12.9 <.001
Clinical Symptoms
Paroxysmal vertigo (with nystagmus) 5 (3) 0 
Paroxysmal dizziness (with nystagmus) 16 (1) 0 
Hearing loss 2 2 
Headache 0 1 
Chronic neurologic deficit 0 3 
Transient neurologic deficit 4 0 
Risk Factors for Cerebral Blood Flow
Hypertension 11 3 NS^†
Diabetes Mellitus 1 0 NS^†
Hyperlipidemia 7 7 NS^†
Smoking 3 4 NS^†
Note.—PCB, posterior circulation ischemia; SBP, systolic blood pressure; hypertension, SBP > 140 mm Hg; diabetes mellitus, fasting blood glucose level > 200 mg/dL; hyperlipidemia, total blood cholesterol level > 200 mg/dL or neutral fat > 160 mg/dL; smoker, habitual smoking during study.
* Student t test.
† Fisher exact probability test.