Prevalence ratios (95% CIs) for clusters of symptoms at day of interview by exposure group defined by change in acetylcholinesterase activity (% inhibition) between the low and high exposure period adjusted for sex and age (n=408)
| Symptom | No inhibition (<5.05%) (n=8) | Medium inhibition (⩾5.05%–<30%) (n=75) | High inhibition (⩾30%) (n=55) |
| Skin or extremities (⩾3/8) | 1 | 0.82 (0.35 to 1.94) | 1.78 (0.78 to 4.08) |
| Respiratory (⩾3/7) | 1 | 2.04 (0.78 to 5.38) | 2.92 (1.12 to 7.61) |
| Systemic (⩾3/8) | 1 | 1.20 (0.50 to 2.85) | 1.94 (0.82 to 4.59) |
| Eye (⩾2/2) | 1 | 0.89 (0.27 to 2.94) | 2.92 (0.97 to 1.03) |
| CNS (⩾5/14) | 1 | 2.56 (0.99 to 6.62) | 3.29 (1.26 to 8.60) |