Summary of findings from four neurobehavioral tests: Symbol Digit, Digit Symbol, simple Reaction Time and Finger Tapping
| Study | Symbol Digit (N=7) | Digit Symbol (N=3) | Simple Reaction Time (N=6) | Finger Tapping (N=4) |
| Abdel Rasoul et al, 200816 | + | |||
| Cole et al, 19975 | 0 | |||
| Eckerman et al, 200717 | − | + | ||
| Farahat et al, 20037 | + | |||
| Kamel et al, 20039 | − | + | ||
| Rodnitzky et al, 197518 | 0 | |||
| Rohlman et al, 200712 | + | + | 0 | |
| Rohlman et al, 200111 | + | + | 0 | |
| Roldan-Tapia et al, 200514 | − | |||
| Rothlein et al, 200613 | − | − | + | |
| Stephens et al, 199519 | + | − |
+, significantly poorer performance in exposed group; 0, no significant difference between control and exposed groups; −, non-significant trend observed with poorer performance in non-exposed group.