Spss version 16.0 for windows

The statistical analysis was conducted using SPSS version 16.0 for Windows (SPSS Inc., Chicago, IL, USA). Continuous variables were expressed as mean ± standard deviations and the differences between the mild lesions group and moderate and severe lesions group were analyzed using the Mann-Whitney U-test. Categorical variables were expressed as proportions and the differences in categorical variables were analyzed using chi-square test. Pearson correlation analysis was conducted to determine the correlation between SYNTAX score and each clinical and laboratory factor. The multiple linear regressions of SYNTAX score were performed using significantly correlated lipid factors, HDL-C and ApoA1, respectively. The receiver operating characteristic (ROC) curve of ApoA1 for the prediction of moderate and severe lesions was performed, then the AUC and cutoff points of ApoA1 to predict moderate and severe lesions were calculated. Additionally, the distance on the ROC curve of each ApoA1 was calculated as the square root of [(1-sensitivity)² + (1 - specificity)²]. The ApoA1 value with the shortest distance on the ROC curve was considered as appropriate cutoff. Finally, the SYNTAX score between patients with different ApoA1 values were calculated and compared using Mann-Whitney U-test. Statistical significance was established at P < 0.05.

SPSS version 16.0 for Windows was used for all analyses. The Student’s t-test was used to compare other data. Between these subgroups, positive rates of stain were compared by Chi-square. Survival analysis was performed using Kaplan–Meier curves, and the differences were revealed by log-rank test. p < 0.05 was considered statistically significant, and p < 0.01 was considered even more strongly.