↵a Data are represented as mean ± SD. NIT is decreased from 6 to 12 months in the double-PED group (P = .0092); there were no significant differences for the single- and triple-PED groups (P = 1.0). At 6 months, the NIT values in the double (P = .0049) and triple (P = .0012) groups are significantly higher than those in the single group. There are no significant differences between double- and triple-PED groups at this time point (P = .4191). At 12 months, the NIT in the triple-PED group is significantly higher than in single- and double-PED groups (P < .001); there are no significant differences between single and double groups (P = 1.0). When the percentage stenosis is examined, there is no difference between 6 and 12 months for the single, double, or triple PED. At 6 months, the percentage stenoses in double and triple groups are both higher than that in the single group (P < .005). There are no significant differences between the double and triple groups (P = .2237). At 12 months, the percentage stenoses for the double (P = .0026) and triple groups (P < .0001) are higher than that in the single group; the percentage stenosis in the triple group is also higher than that in the double group (P < .0001). There are no significant differences in the medial area either for PED groups with time or for PED groups that were examined within each time point.