Fig. 1From: Short and mid-term outcomes of valve-sparing, aortic root reimplantation (David’s procedure)Aortic insufficiency (AI) in pre-operation and follow-up echocardiography exams. Related samples Friedman’s two-way analysis of variance was used to compare follow-up echos with the pre-op echo. Test statistics were 1.84, 1.65, and 1.57 for comparing post-op, mid-, and long-term follow-ups with pre-op echocardiography (P-value < 0.001 for all)Back to article page