Age And Reoperation Risk Graphic

From the 2010 study referenced in my post the other day:

Reoperation after bioprosthetic aortic valve replacement (AVR). The freedom from reoperation was determined for patients according to the age at initial AVR. These patients did not receive concomitant mitral valve replacement. A, 294 reoperations for the 3152 patients who underwent bioprosthetic AVR. B, 46 reoperations for the 2158 patients who underwent bioprosthetic AVR with contemporary, stented bioprostheses.