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Table 3 Correlation between diameter of PFO and ischemia lesion positivity

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

PFO diameter Ischemia lesion, n (%) Test χ2 P value
Yes No
PFO ≥ 4 mm 37 (94.9) 2 (5.1) Chi-square test for trend 24.22  < 0.001
4 mm ≥ PFO > 2 mm 24 (68.6) 11 (31.4)    
PFO < 2 mm 10 (38.5) 16 (61.5)    
sum 71 (71.0) 29 (29.0)