Statistical analysis
Statistical analysis was performed using IBM SPSS Statistics for
Windows, Version 21.0. (IBM Corp. Armonk, NY: USA. Released 2012). The
normality distribution patterns of variables were evaluated using
histograms, probability plots, and analytical methods
(Kolmogorov-Smirnov). Variables showed as mean ± standard deviation.
Categorical variables were presented as percentages. Continuous data
was compared in gender and age groups using independent T test and
One-way ANOVA respectively. Turkey’s HSD was used in post-hoc
comparisons. Categorical variables were compared using the Chi-square
test. Pearson correlation test was performed for bivariate
correlations. All tests were 2-tailed and the p value was less than 0.05
(p < 0.05) was accepted as significant.
Intra-observer and inter-observer variability was evaluated in 50
randomly selected subjects. Intraclass correlation coefficient with 95%
confidence interval and the relative differences (means±SD) were
reported overall. The Bland-Altman plot was drawn to obtain better
insights into the data quality between two echocardiographers.