Table 3. Proportions of the phenotypic correlations between ADHD symptoms and vocabulary scores due to genetic (A), shared environmental (C) and non-shared environmental (E) influences.
| Time 1 | Time 2 | Time 3 | |||
|---|---|---|---|---|---|
| rph | -0.19 | -0.23 | -0.16 | ||
| % of rph due to | Total a | Time-specific b | Total a | Time-specific b | |
| A | 74% (0.14) | 61% (0.14) | 30% (0.07) | 50% (0.08) | 25% (0.04) |
| C | 16% (0.03) | 17% (0.04) | 9% (0.02) | 12.5% (0.02) | 12.5% (0.02) |
| E | 10% (0.02) | 22% (0.05) | 13% (0.03) | 37.5% (0.06) | 25% (0.04) |
ADHD = attention deficit hyperactivity disorder; rph = phenotypic correlation
aProportions of the phenotypic correlation due to total genetic or environmental influences (i.e. transmitted plus age-specific effects).
bProportions of the phenotypic correlation due to time-specific genetic or environmental influences specific to early adolescence.
Figures in parentheses refer to the absolute contributions of A, C and E respectively to the phenotypic correlations between ADHD symptoms and vocabulary scores.