Statistical analysis
The continuous and categorical variables are represented as the median
(interquartile range [IQR]) and as counts (percentage),
respectively. The means for continuous variables were compared using
independent-sample t tests when the data were normally
distributed; otherwise, the Mann-Whitney test was used. The associations
of maximum heart rate, HADS-A score, and HADS-D score with palpitation
score were analyzed by Pearson’s correlation. All data is analyzed using
SPSS version 20.0 (SPSS, Chicago, Illinois). The differences were
considered statistically significant at a P value of <
0.05 (two-sided).