Datasets from LTSs with (LTS+) and without COPD (LTS−) compared with HNSs showing (A) level of MUC2 in unfiltered BAL samples and (B) proportion (%) of large MUC2 complexes in BAL samples from Material 2. Open (white) symbols denote subjects with colonization by bacterial pathogens whereas solid (black) symbols denote subjects without this type of colonization. The horizontal bars depict the median value for each study group. Analytical statistics are shown according to Kruskal–Wallis one-way ANOVA on ranks.