Figure 1

Sputum cell type differentials. Box plots of sputum cell percentages (1A) and total eosinophil (1B) and neutrophil (1C) number are shown for young subjects (white bars; n = 11), and older subjects (gray bars; n = 6). One young subject had > 80% epithelial cells in the sputum (indicating oral/salivary contamination) and was not included in the sputum differential. Comparisons between the young and older groups were performed with t test analysis or Mann-Whitney rank sum analysis. Statistical significance was defined at p < 0.05. Mac = macrophage; Eos = eosinophil; Neut = neutrophil; Lymph = lymphocyte; Median: ----- (solid)