Fig. 2.

Kaplan-Meier curves of time to recurrent biliary obstruction (TRBO) according to the type of stent. TRBO of the covered self-expandable metallic stent (cSEMS) group was significantly longer than that of the PS group (p=0.045). Median TRBO was 202 days (95% confidence interval [CI], 127–365) in the plastic stent (PS) group and 646 days (95% CI, 217–NA) in the cSEMS group. Non-RBO rates at 3, 6, and 12 months were 72.9%, 55.4% and 35.3% in the PS group and 85.0%, 75.5% and 51.5% in the cSEMS group, respectively. NA, not available.