Fig. 4

PAR% of particular risk factors associated with ISR among CAD patients with syphilis. Based on Cox proportional hazard models, the PAR% values of particular risk factors associated with ISR including average stent length ≥ 35 mm, titres of TRUST > 1:16, and successful antisyphilitic treatment are 12.1%, 24.0%, and -39.6%, respectively, among CAD patients with syphilis. Summing the PAR% of a single risk factor to derive the total PAR% of ISR among CAD patients with syphilis undergoing PCI was not recommended because there was a confounder between the risk factors in this study. PAR%, population attributable risk percentage; ISR, in-stent restenosis; CAD, coronary artery disease; TRUST, toluidine red unheated serum test; PCI, percutaneous coronary intervention