Figure 1 | Scientific Reports

Figure 1

From: Early markers of cardiovascular disease are associated with occupational exposure to polycyclic aromatic hydrocarbons

Figure 1

Trends for work tasks, use of fuel by clients, and use of masks in chimney sweeps. (a) Fraction of work (%) for different work tasks from 1963 to 2013. (b) Fraction of work (%) with different types of fuels used by clients from 1975 to 2013. (c) Percentage of chimney sweeps that used masks (simple and/or advanced) during work for five different work tasks. *Wilcoxson signed rank test for work tasks before/after the year 2002. **Soot sweeping.

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