Concentration-dependent increase in symptoms due to diesel exhaust in a controlled human exposure study.

Redoing this analysis with only the 15 participants that completed all four exposures did little to change the output, but eye category symptoms were no longer significantly changed ( P > 0.1) and hence total symptoms moved to borderline significance ( P = 0.05–0.1).

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Compared to FA, DE at 150 μg/m 3 induced an increase in total (8.45 ± 3.92, P = 0.04) and eye (3.18 ± 1.55, P = 0.05) symptoms, and a trend towards significance in the constitutional (1.49 ± 0.86, P = 0.09) and nasal (1.71 ± 0.96, P = 0.08) symptoms (Fig. 2 ).

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P ≤ 0.05 were considered statistically significant, while P values 0.051–0.1 were considered to be “trending towards significance”.

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