Table 6. Cox regression analyses of age difference (young age group vs. old age group) with one-month and twelve-month MACEs.

Model	One-month MACEs		Twelve-month MACEs
	Hazard ratio (95% CI)	p	Hazard ratio (95% CI)	p
Unadjusted	0.94 (0.71-1.25)	0.677	0.77 (0.66-0.89)	0.001
Adjusted for sex	0.85 (0.63-1.15)	0.295	0.73 (0.62-0.86)	<0.001
Adjusted for selected variables*	0.90 (0.65-1.24)	0.517	0.74 (0.62-0.88)	0.001
Multivariable adjusted†	0.95 (0.60-1.51)	0.828	0.86 (0.68-1.10)	0.233

^*The variables of baseline clinical characteristics; sex, BMI, presence of typical symptoms, chest pain and dyspnea, history of previous angina, initial vital signs (systolic blood pressure, diastolic blood pressure, and heart rate), Killip classification on admission, symptom-to-door time, arrhythmia, cardiovascular risk factors (hypertension, diabetes mellitus, dyslipidemia, smoking, family history of coronary heart disease, and previous ischemic heart diseases), cerebrovascular or peripheral arterial diseases, and heart failure. †The variables considered potentially relevant on univariate analyses were included; all of the variables mentioned above as the selected variables, treatment strategy, door-to-balloon time, angiographic findings (number of diseased vessels, lesion location and type), procedural findings (stent type, length and diameter, and number of implanted stents), cardiovascular medications (aspirin, clopidogrel, beta-blockers, calcium channel blockers, angiotensin-converting enzyme inhibitors, Angiotensin II receptor blockers, statin, nitrate, spironolactone, and diuretics), renal insufficiency (estimated glomerular filtration rate<60 mL/min/1.73m²), and left ventricular dysfunction (left ventricular ejection fraction<40%). MACE: major adverse cardiac event , CI: confidence interval