Finally , no differences were observed in definite or probable stent thrombosis at 12 months ( 0.3 % vs. 0.4 % ; difference : -0.1 % ; 95 % CI : -0.7 to 0.4 ; p = 0.694 ) and between 12 and 24 months of follow-up ( 0.1 % vs. 0 % ; difference : 0.1 % ; 95 % CI : -0.1 to 0.4 ; p = 0.305 ) .