Statistical analysis
Frequency distribution of categorical variables are reported as
frequencies and percentages. Data is presented as mean (standard
deviation) or median (interquartile range) where appropriate. To compare
differences of echocardiographic parameters among pulmonary hypertension
categories, we performed a one-way ANOVA or Kruskal-Wallis test whether
it met assumptions of parametric tests or not, and a Dunn’s post hoc
test was also assessed to evaluate differences among groups.