Fig. 4
From: Health effects of exposure to diesel exhaust in diesel-powered trains
DNA strand breaks in peripheral blood mononuclear cells after exposure in electric and diesel trains. The circles in grey represent DNA strand breaks in electric train (one exposure scenario) or diesel train (mean of two exposure scenarios). The dark line represents the mixed-effects model without adjustments. Higher levels of DNA strand breaks were observed on group level (solid symbols) after exposure in diesel trains (p < 0.05)