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