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Distribution of FEF25-75 z-score across AL severity. A box plot demonstrating the distribution of FEF25-75 z-score across AL severity. The plot shows median, IQR, minimum and maximum. AL severity was assessed using FEV1 z-score. The presented p values are for Mann-Whitney U test, and the Kruskal Wallis tests p value was <0.001 for all. AL, airflow limitation; FEF25-75, forced expiratory flow between 25% and 75% of vital capacity.
