Table 2.
Results of Univariable and Multivariable Linear Regression Analyses of Factors for the Residual SYNTAX Score of Patients with STEMI.
| Variable | Entire cohort (n=219) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Univariable Analysis | Model 1a | Best predictive modelb | |||||||||
| Unstandardized β | 95% CI | p value | Unstandardized β | 95% CI | p value | Unstandardized β | 95% CI | p value | |||
| Age, per 1 year increment | 0.091 | 0.029, 0.152 | 0.004 | 0.038 | -0.049, 0.126 | 0.385 | 0.058 | -0.012, 0.129 | 0.105 | ||
| Male | 0.608 | -0.156, 2.778 | 0.581 | 0.378 | -2.245, 3.001 | 0.776 | |||||
| Body mass index, per 1 kg/m2 increment |
-0.221 | -0.439, -0.004 | 0.046 | -0.207 | -0.483, 0.070 | 0.142 | -0.234 | -0.469, 0.001 | 0.051 | ||
| Smoking history | -0.061 | -1.879, 1.758 | 0.948 | -0.593 | -2.625, 1.439 | 0.565 | |||||
| History of MI | 1.844 | -1.619, 5.307 | 0.295 | 4.533 | -1.098, 10.164 | 0.114 | |||||
| History of PCI | 0.796 | -2.571, 4.164 | 0.642 | -2.444 | -7.879, 2.991 | 0.376 | |||||
| Killip class IV MI | 3.325 | 0.164, 6.486 | 0.039 | 1.144 | -3.626, 5.915 | 0.636 | |||||
| ELC | 3.549 | 1.618, 5.480 | <0.001 | 3.253 | 1.202, 5.304 | 0.002 | 3.620 | 1.681, 5.559 | <0.001 | ||
| Comorbidities, n (%) | |||||||||||
| Hypertension | -0.926 | -2.790, 0.939 | 0.329 | -0.385 | -2.469, 1.699 | 0.715 | |||||
| Dyslipidemia | -0.059 | -0.2477, 1.296 | 0.538 | 0.221 | -1.915, 2.358 | 0.838 | |||||
| Heterozygous familial hypercholesterolemia | -1.624 | -5.818, 2.570 | 0.446 | -1.320 | -6.251, 3.610 | 0.597 | |||||
| Diabetes mellitus | 0.083 | -1.956, 2.121 | 0.936 | 0.431 | -1.769, 2.632 | 0.699 | |||||
| Hemodynamic parameters | |||||||||||
| Systolic blood pressure, per 1 mmHg increment | -0.015 | -0.045, 0.014 | 0.306 | 0.041 | -0.017, 0.099 | 0.161 | 0.019 | -0.011, 0.050 | 0.216 | ||
| Diastolic blood pressure, per 1 mmHg increment | -0.006 | -0.048, 0.036 | 0.795 | -0.019 | -0.109, 0.071 | 0.680 | |||||
| Heart rate, per 1 bpm increment | -0.002 | -0.049, 0.045 | 0.928 | -0.042 | -0.099, 0.015 | 0.149 | |||||
| Echocardiographic variables | |||||||||||
| Diastolic LV diameter, per 1 mm increment | -0.079 | -0.212, 0.054 | 0.243 | -0.139 | -0.370, 0.093 | 0.238 | |||||
| Systolic LV diameter, per 1 mm increment | 0.033 | -0.076, 0.143 | 0.549 | 0.110 | -0.082, 0.301 | 0.260 | |||||
| LVEF, per 1% increment | -0.034 | -0.110, 0.043 | 0.388 | -0.042 | -0.150, 0.067 | 0.449 | |||||
CI: confidence interval, ELC: earlobe crease, LV: left ventricle, LVEF: left ventricular ejection fraction, MI: myocardial infarction, PCI: percutaneous coronary intervention, STEMI: ST-segment elevation myocardial infarction, SYNTAX: synergy between percutaneous coronary intervention with taxus and cardiac surgery
aVariables in the multivariable linear regression model were included using the simultaneous forced entry method based on significant results of univariable analysis and relevant factors for the residual SYNTAX score (age, sex, body mass index, smoking history, History of MI, History of PCI, Killip class IV MI, hypertension, dyslipidemia, heterozygous familial hypercholesterolemia, diabetes mellitus, systolic blood pressure, diastolic blood pressure, heart rate, diastolic LV diameter, systolic LV diameter, LVEF, and ELC).
bBest predictive model, adjusted for significant predictors selected by stepwise linear regression using factors based on Model 1.