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. 2014 Aug 26;9(8):e104069. doi: 10.1371/journal.pone.0104069

Table 1. The FA exposure levels in FA-exposed workers and controls.

Groups Number of workers Number of air samples FA concentrations (ppm)
mean range
High exposure 70 16 0.63 0.36–1.53
Low exposure 48 8 0.15 0.07–0.19
Controls 79 4 <0.008a
a

The limit of detection (0.008 ppm) was used to present the FA level in the control industry.