Fig. 2
From: Health effects of exposure to diesel exhaust in diesel-powered trains
Lung function parameters after exposure in electric and diesel trains. The circles in grey represent individual lung function parameters for electric train (one exposure scenario) or diesel train (mean of two exposure scenarios). The dark line represents the mixed-effects model without adjustments. Lower levels of FEV1 and PEF were observed on group level (solid symbols) after exposure in diesel trains (p < 0.05)