Table 2.
Characteristics of ALSPAC children with available genetic and IQ, or education data
| IQ/education measure | N | % male | Mean age in years (SD) | Mean score (SD) |
|---|---|---|---|---|
| IQ at age 8 | 5300 | 49.7% | 8.6 (0.3) | 105.0 (16.4) |
| IQ at age 15 | 3724 | 48.0% | 15.4 (0.3) | 92.4 (13.1) |
| Key Stage 3 | 6029 | 50.8% | 14.1 (0.3) | 106.5 (24.3) |
| Key Stage 4 | 6535 | 50.5% | 15.0 (0.04) | 133.8 (3.8) |
| Key Stage 5 | 3990 | 45.9% | 16.3 (0.6) | 764.3 (252.7) |
ALSPAC, Avon Longitudinal Study of Parents and Children; IQ, intelligence quotient; SD, standard deviation.