The percentage of uncovered struts was significantly lower in the EES group compared with the SES group ( median value , 6.9 % ; interquartile range [ IQR ] , 3.9-10 .6 % vs. 11.1 % ; IQR , 5.5-29 .4 % , respectively ) at the 3-month follow-up ( P = 0.03 ) , and at the 12-month follow-up ( median value , 1.3 % ; IQR , 0.3-3 .5 % vs. 3.6 % ; IQR , 1.0-9 .4 % ; P = 0.02 ) .