Fig. 1. Polymorphonuclear cells (PMNs) were measured over 4 h as a percent of total cells in tracheal lavage fluid at multiple time points. Data are presented as median with 25th–75th percentiles (  boxes ) and 5th–95th percentiles (  whiskers ). **  P < 0.01 compared with time 0 by Friedman and Wilcoxon test.