Patency of internal mammary artery and saphenous vein grafts after coronary artery bypass surgery. The 10-year patency rate was significantly higher with the arterial grafts. There was a variable number of patients studied at each interval, accounting for the irregular shape of the curves.
Data from: Loop FD, Lytle BW, Cosgrove DM, et al, N Engl J Med 1986; 314:1.
