Figure 4.

Treatment persistence over time (only clopidogrel)

^⊓total = 14 747, ^⊓PCI = 10 176,

^{⊓PCI with non-drug stent} = 7 949, ^{⊓with drug stent} = 1445

PCI = percutaneous coronary intervention, non-drug = non-drug-eluting, drug = drug-eluting

Curve profile explanation: Note that, since the discontinuation criterion allowed a 90-day gap, determining the therapy discontinuation rate was methodologically restricted to 90 days after the observation start point. However, several censure criteria (that influenced the survival chances) were present at that point, causing the curve profile to sharply drop at the first therapy discontinuation value.