Statistical analyses
REGRESSION
Statistical analysis was performed using GraphPad Prism version 9.0 (GraphPad Software Inc., San Diego, CA, USA). Normal distribution of quantitative variables was tested by the Kolmogorov–Smirnov test. Descriptive statistics are presented as mean ± standard deviation (SD), median (25th to 75th percentile), or number (%), as appropriate. Student’s T or Mann–Whitney U-test tests were computed to assess statistical differences between groups for normal or non-normal quantitative variables, respectively. Categorical variables were analyzed by Fisher’s exact test when appropriate. Correlations were examined by Spearman rank test or Pearson test. Multiple linear regression was applied for peak V′O