Statistical Analysis
SPSS 16.0 statistical analysis software was used for statistical
analysis. All continuous data were expressed as mean ± standard
deviation (±S). Paired data following a normal distribution were
analyzed using t-tests, while independent samples were analyzed using
independent sample t-tests. Binary logistic regression analysis was
performed to select valuable S and Sr parameters for detecting viable
myocardium. Receiver operating characteristic (ROC) curves were used to
calculate the area under the curve (AUC) and determine the optimal
cutoff points, sensitivity, specificity, and accuracy for diagnosing
viable myocardium. Chi-square test was used for intergroup comparison of
rates. A p-value ≤0.05 was considered statistically significant, with a
significance level of α=0.05.
Additional methods can be found in SI Appendix, SI Materials and
Methods.