Table 4. The prediction model based on the Cox proportional hazard regression model for 2-year POCE with the two identified predictors based on the developmental dataset.

Factor	β	S.E.	HR	95% confidence interval for HR	P-value
β Indicates the regression coefficient. Multicollinearity diagnostics: ACEF score: 0.988 tolerance, 1.012 VIF; QFR: 0.988 tolerance, 1.012 VIF. ACEF: age, creatinine, and ejection fraction; POCE: patient-oriented composite endpoint; QFR: quantitative flow ratio.
Post-PCI QFR ≤ 0.92	1.006	0.167	2.737	[1.974, 3.794]	< 0.001
ACEF	0.863	0.206	2.371	[1.584, 3.549]	< 0.001
Constant	3.912	0.363