Fig. 1

Frequency distribution for AChE activity in farming (n = 41) and non-farming participants (n = 14); a) AChE in U/ml and b) AChE in U/g; (Baseline: Cholinesterase test 0, At 3–4 week intervals: Cholinesterase test 1, At 6-weeks: Cholinesterase test 2, At 9-weeks: Cholinesterase test 3)