Causes associated with recurrent choledocholithiasis following therapeutic endoscopic retrograde cholangiopancreatography: A large sample sized retrospective study

Figure 1 Kaplan–Meier curves showing the recurrence rate of CBD stones according to age (< 50 years, blue line; 50-59 years, green line; 60-69 years, yellow line; ≥ 70 years, red line) (log-rank P < 0. 0001).