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Table 4: Contingency table (2 × 2) showing the lack of correlation between of epidural leak and type of epidural mass, “large convex” or “small concave”^{^a}
Epidural Leak+ Epidural Leak− Total
Epidural mass S CV 3 10 13
Epidural mass L CX 1 17 18
Total 4 27 31
Note:—S CV indicates small concave; L CX, large convex.
↵a Fisher exact test. Two-tailed P = .283.