.005) in the covered (326+/-145 microm) compared with the bare (219+/-62 microm) stents. Intima-to-media height ratios were greater in the covered stents (3.0+/-1.1 compared with 1.1+/-0.2, p<0.003). Mean surface area endothelialization in the proximal, middle, and distal sections of each device was similar (p>0.05) in covered (59%, 56%, and 69%) and bare (59%, 65%, and 53%) stents.