Table 1.
Group statistics on IQ, reaction times (RTs), age and head motion. Groups are based on educational level, and subgroups are defined by educational level and IQ. Standard errors are presented in parentheses.
| IQ | Reaction times in ms | Head motion average in mm | Head motion max in mm | Age | |
|---|---|---|---|---|---|
| Pre-vocational education | 91.3 (2.4) | 805 (47) | .09 (.02) | 2.01 | 14.5 (.2) |
| Pre-university education | 107 (2.0) | 773 (39) | .08 (.01) | 2.21 | 14.3 (.2) |
| Subgroups | |||||
| I (IQ 70–90) | 80 (2.3) | 818 (74) | .11 (.02) | 2.01 | 15 (.4) |
| IIa (IQ 90–110) | 98.6 (1.3) | 799 (36) | .07 (.01) | 2.0 | 14.1 (.3) |
| IIb (IQ 90–110) | 99.3 (1.8) | 779 (41) | .08 (.01) | 2.21 | 14.6 (.4) |
| III (IQ 110–130) | 115.6 (2.6) | 764 (38) | .07 (.02) | .81 | 14.6 (.4) |