Summary of the 17 studies included in the meta-analysis
| Study | Cohorts | Number of exposed/controls | Age in years (exposed/controls) | Duration of exposure (years) | Assessment tool | Job category | |
| Abdel Rasoul et al, 200816 | 1 | <15 years old | 30/30 | 12.8/12.5 | 3.5 | WISC | Applicators |
| 2 | 15–18 years old | 20/20 | 16.8/16.8 | 7.2 | WISC | Applicators | |
| Bazylewicz-Walczak et al, 19994 | 3 | 26/25 | 35.4/36.0 | 11.9 | NCTB | Greenhouse workers | |
| Cole et al, 19975 | 4 | Farmworkers | 28/27 | 34.74/36.4 | 10.9 | NCTB | Farmworkers |
| 5 | Applicators | 123/72 | 38.0/36.4 | 16.6 | NCTB | Applicators | |
| Daniel et al, 19926 | 6 | English speakers | 27/35 | 33.7/29.8 | 9.4 | NES | Applicators |
| 7 | Spanish speakers | 22/5 | 30.2/34.0 | 4.4 | NES | Applicators | |
| Eckerman et al, 200717 | 8 | 38/28 | 14.3/12.7 | * | BARS | Farmworkers | |
| Farahat et al, 20037 | 9 | 52/50 | 40.6/42.5 | 18.0 | WAIS | Farmworkers | |
| Fiedler et al, 199720 | 10 | 57/42 | 47.6/47.7 | 27.4 | NES | Applicators | |
| Gomes et al, 19988 | 11 | 226/226 | * | 5.0 | Individual tests | Farmworkers | |
| Kamel et al, 20039 | 12 | 288/51 | 38.0/39.0 | 15.9 | BARS | Farmworkers | |
| Korsak and Sato, 19771 | 13 | 16/16 | 34.4/41.1 | * | HRB | Farmworkers | |
| Maizlish et al, 198722 | 14 | 46/53 | 29.0/56.0 | 0.1 | NES | Applicators | |
| Rodnitzky et al, 197518 | 15 | 23/23 | 39.17/38.8 | * | Individual tests | Applicators | |
| Rohlman et al, 200712 | 16 | <18 years old | 13/15 | 13.2/13.3 | * | BARS | Farmworkers |
| 17 | ≥18 years old | 120/41 | 23.9/26.5 | 3 | BARS | Farmworkers | |
| Rohlman et al, 200111 | 18 | 69/29 | 28.2/30.7 | 9.4 | BARS | Farmworkers | |
| Roldan-Tapia et al, 200514 | 19 | 40/26 | 31.9/36.3 | 10.9 | NCTB | Applicators | |
| Rothlein et al, 200613 | 20 | 92/45 | 29.7/27.8 | * | BARS | Farmworkers | |
| Stephens et al, 199519 | 21 | 146/143 | 46.8/40.5 | * | Individual tests | Sheep farmers | |
Individual tests are separate non-computerised tests, for example, Trail Making A and B, Pursuit Aiming II, Santa Ana pegboard and Benton Visual Retention Tests.
↵* Data not available.
BARS, Behavioural Assessment and Research System; HRB, Halstead-Reitan Battery; NCTB, Neurobehavioral Core Test Battery; NES, Neurobehavioral Evaluation System; WAIS, Wechsler Adult Intelligence Scale; WISC, Wechsler Intelligence Scale for Children.