In good clopidogrel responders ( inhibition of VASP index > 30 % ) , the clopidogrel antiplatelet effect remained non-inferior to placebo during rabeprazole ( difference 3.4 % [ -1.7 ; 8.5 ] ) but not omeprazole ( difference 7.5 % [ 2.5 ; 12.6 ] ) co-administration .