Fig. 2
From: Occupational exposure to particles and mitochondrial DNA - relevance for blood pressure
Associations between relative mtDNA copy number and personal respirable dust. Scatterplots with linear and loess fit lines showing the associations between respirable dust and relative mtDNA copy number. Associations are (a) among all welders, (b) among welders with exposure level lower than 0.7 mg/m3 (median concentration = 0.5 mg/m3) and (c) among welders with exposure level higher than 0.7 mg/m3 (median concentration = 2.0 mg/m3). The cut-off of exposure level was based on median value of respirable dust from 101 welders (including measured and estimated exposures)