Fig. 2. Levels of interleukin 1β (IL-1β; A ), interleukin 8 (IL-8; B ), and tumor necrosis factor α (TNF-α; ( C ) were measured by enzyme-linked immunosorbent assay in tracheal lavage fluid. Data are presented as median (pg/ml) with 25th–75th percentiles ( boxes ) and 5th–95th percentiles ( whiskers ). Differences not significant by Friedman and Wilcoxon test.