Fig. 2From: Partially covered metal stents have longer patency than uncovered and fully covered metal stents in the management of distal malignant biliary obstruction: a retrospective studyKaplan–Meier graph showing stent patency among the three groups. The cumulative time to stent dysfunction or patient death was significantly longer in the partially covered group then the other two groups (vs uncovered, p = 0.013; vs fully covered, p = 0.010). There was no significant difference between the uncovered group and the fully covered group (p = 0.830)Back to article page