Table 2 Risk factors of ISR by cox proportional hazard model among study patients undergoing PCI

Age ≥ 50 years

0.88 (0.31–2.47)

0.803

9.09 (0.87–94.63)

0.065

Gender-Male

1.94 (0.44–8.51)

0.378

0.50 (0.04–6.27)

0.594

Smoking history

1.08 (0.38–3.04)

0.888

0.96 (0.06–16.78)

0.979

Alcoholic drinking

2.65 (0.99–7.10)

0.053

4.82 (0.65–35.52)

0.123

Cardiovascular syphilis

1.07 (0.14–8.09)

0.948

4.81 (0.39–59.47)

0.221

Hypertension

0.75 (0.29–1.90)

0.541

0.68 (0.18–2.64)

0.576

Diabetes

1.32 (0.52–3.34)

0.562

1.11 (0.36–3.46)

0.860

Dyslipidemia

2.10 (0.68–6.47)

0.198

1.40 (0.35–5.67)

0.638

HCY ≥ 15umol/L

1.80 (0.70–4.67)

0.227

1.39 (0.40–4.81)

0.606

Titres of TRUST > 1:16

4.58 (1.68–12.47)

0.003

3.72 (1.22–11.36)

0.021

Number of target vessels ≥ 3

2.69 (0.95–7.60)

0.062

2.16 (0.58–8.01)

0.249

Implanted stent numbers > 3

3.31 (1.27–8.66)

0.015

1.92 (0.47–7.86)

0.364

Average stent length ≥ 35 mm

3.49 (1.13–10.75)

0.029

4.47 (1.30–15.44)

0.018

Average stent diameter ≤ 3 mm

3.26 (0.43–24.61)

0.252

1.84 (0.20–17.37)

0.595

Effective DAPT

1.08 (0.39–3.04)

0.881

1.32 (0.34–5.15)

0.694

Successful antisyphilitic treatment

0.08 (0.01–0.61)

0.015

0.12 (0.02–0.95)

0.045