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Table 4 Correlation between diameter of PFO and characteristics of ischemia lesion

From: The correlation between patent foramen ovale and brain ischemia in plateau residents

Ischemia lesion characteristics PFO ≥ 4 mm (n = 37) 4 mm ≥ PFO > 2 mm (n = 24) PFO < 2 mm (n = 10) Test χ2 P value
Location, n (%)     Chi-square test 0.974 0.614
 Unilateral 28 (75.7) 17 (70.8) 6 (60.0)    
 Bilateral 9 (24.3) 7 (29.2) 4 (40.0)    
Left or right hemispheres, n (%)     Chi-square test 0.895 0.639
 Left 16 (43.2) 13 (54.2) 4 (40.0)    
 Right 21 (56.8) 11 (45.8) 6 (60.0)    
Number, n (%)     Chi-square test 9.655 0.008
 Single 12 (32.4) 15 (62.5) 8 (80.0)    
 Multiple 25 (67.6) 9 (37.5) 2 (20.0)    
Circulation, n (%)     Chi-square test 0.825 0.662
 Anterior 20 (54.1) 14 (58.3) 7 (70.0)    
 Posterior 17 (45.9) 10 (41.7) 3 (30.0)