Statistics
IBM SPSS Statistics for Windows, Version 23.0 (IBM Corp., Armonk, NY,
USA) was used for statistical analysis. Continuous variable data were
presented as the mean ± standard deviation (SD) or as the median.
Categorical variables are presented as the percentage. To test for
normality of distribution, the Kolmogorov–Smirnov test was used. The
Pearson test and Spearman tests were used for correlation analysis to
assess the correlation of the RV parameters and PVR with the LA strain
parameters. N-terminal pro-brain natriuretic peptide (NT-pro-BNP) levels
were analyzed as the logarithmic function to provide a normal
distribution.
Patients were grouped according to their LVDD grades. For categorical
variables, the trend test was performed, and for continuous variables,
the one-way ANOVA test or Kruskal–Wallis tests were used to determine
the difference among the diastolic dysfunction grades.