Table 2. Bivariate phenotypic correlations between parental education and cognitive abilities.
| Cognitive abilities | |||||||
|---|---|---|---|---|---|---|---|
| Variables | GK | V | FC | FR | Total | VB | Non-VB |
| Parental education (PE) | .21 | .19 | .18 | .17 | .23 | .22 | .19 |
| General knowledge (GK) | .62 | .49 | .39 | .74 | .87 | .48 | |
| Vocabulary (V) | .45 | .41 | .76 | .93 | .48 | ||
| Figural classification (FC) | .60 | .82 | .52 | .87 | |||
| Figural reasoning (FR) | .81 | .44 | .92 | ||||
| Total Score | .83 | .91 | |||||
| Verbal (VB) | .53 | ||||||
Correlations are based on one randomly selected member of each twin pair (n = 531). All correlations are significant at p < .001.