Statistics
Data was analysed using IBM SPSS Statistics for Windows, Version 27.0 and GraphPad Prism 9.4.0. Normally distributed data are presented as means and standard deviations. Non-normally distributed data are presented as medians and interquartile ranges. Differences between two groups were analysed by independent samples t-test or Mann-Whitney U test depending on normality of the data. To compare three or more groups, the one-way ANOVA with Bonferroni Post-Hoc or the Kruskal Wallis test with pairwise comparisons was performed, as appropriate. For categorical data, the chi-squared test was used. Agreement between spirometric and oscillometric BDRs was assessed using kappa statistics, where Cohen’s kappa coefficient (k) of >0.75 represented excellent agreement, 0.40–0.75 represented a fair to good agreement, and <0.40 was indicative of poor agreement.34