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Fig. 1 | Particle and Fibre Toxicology

Fig. 1

From: Chronic exposure to diesel exhaust may cause small airway wall thickening without lumen narrowing: a quantitative computerized tomography study in Chinese diesel engine testers

Fig. 1

The distribution of CCAM in non-DETs (n = 53) and DETs (n = 53) by smoking status. CCAM in DETs was significantly higher than that seen in non-DETs regardless of smoking status (all Ps < 0.04). Moreover, CCAM did not vary by smoking status in either non-DETs (P = 0.37) or DETs (P = 0.11) using Wilcoxon rank sum test. Red box represents DET, Blue box represents non-DET. The five horizontal bars from bottom to top represent the minimum, first quartile, median, third quartile, and maximum. Symbols (e.g., and +) represent means inside the box and outliers outside the box. CCAM = carbon content in airway macrophage; DET = diesel engine tester

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