2.4 Statistical analysis
Kolmogorov-Smirnov Z-test was used to determine the normal distribution of continuous variables. Continuous data are presented as mean±SD or median (interquartile range). The χ2 test and unpaired Student’s t-test were used to compare categorical and continuous variables respectively between two different groups of patients. Within group changes from baseline and post-dipyridamole were assessed using the paired Student’s t-test. Changes in studied echocardiographic parameters following dipyridamole administration were compared using Repeated Measures ANOVA analysis. P values were always two-sided and a value of p<0.05 was considered significant. The SPSS statistical software package (IBM SPSS Statistics, Version 23) was used.