Table 3. Phenotypic correlations, parameter estimates, and derived covariance variance components (and 95% confidence intervals) from the correlated factors solution of the Cholesky model.
| Hyperactivity- impulsivity |
Inattention | MRT | RTV | CE | |
|---|---|---|---|---|---|
| Phenotypic correlations | |||||
|
| |||||
| Inattention | 0.58 (0.54 - 0.62) | ||||
| MRT | 0.10 (0.04 - 0.17) | 0.21 (0.15 – 0.27) | |||
| RTV | 0.16 (0.10 - 0.22) | 0.24 (0.18 – 0.30) | 0.79 (0.76 - 0.81) | ||
| CE | 0.09 (0.03 - 0.15) | 0.12 (0.06 – 0.18) | −0.11 (−0.17 - −0.05) | 0.12 (0.07 - 0.18) | |
|
| |||||
| Additive genetic influences | |||||
|
| |||||
| Hyperactivity- impulsivity |
0.48 (0.10 - 0.76) | 0.27 (46%) | 0. 09 (87%) | 0.13 (81%) | 0.06 (61%) |
| Inattention | 0.90 (0.39 - 0.99) | 0.18 (0.05 – 0.40) | 0.16 (78%) | 0.17 (68%) | 0.02 (19%) |
| MRT | 0.19 (0.03 - 0.47) | 0.56 (0.29 – 0.94) | 0.47 (0.28 - 0.62) | 0.36 (46%) | * |
| RTV | 0.31 (0.13 - 0.72) | 0.64 (0.33 – 1.00) | 0.87 (0.72 – 1.00) | 0.37 (0.15 – 0.51) | * |
| CE | 0.17 (−0.06 - 0.57) | 0.11 (−0.38 - 0.49) | −0.45 (−0.96 - −0.03) | −0.10 (−0.91 - 0.36) | 0.23 (0.03 - 0.36) |
|
| |||||
| Dominant genetic influences (Hyperactivity-impulsivity, inattention) / Common environmental influences (MRT, RTV, CE) | |||||
|
| |||||
| Hyperactivity- impulsivity |
0.25 (0.00 - 0.63) | 0.18 (31%) | - | - | - |
| Inattention | 0.57 (0.57 - 1.00) | 0.41 (0.17 – 0.57) | - | - | - |
| MRT | - | - | 0.12 (0.01 - 0.27) | 0.07 (9%) | * |
| RTV | - | - | 0.86 (−1.00 – 1.00) | 0.06 (0.00 – 0.23) | * |
| CE | - | - | 0.93 (−1.00 – 1.00) | 0.99 (−1.00 – 1.00) | 0.04 (0.00 - 0.20) |
|
| |||||
| Child-specific environmental influences | |||||
|
| |||||
| Hyperactivity- impulsivity |
0.27 (0.22 - 0.34) | 0.14 (24%) | 0.01 (13%) | 0.03 (19%) | 0.04 (39%) |
| Inattention | 0.41 (0.28 - 0.52) | 0.41 (0.33 – 0.51) | 0.05 (22%) | 0.08 (32%) | 0.10 (82%) |
| MRT | 0.04 (−0.09 - 0.17) | 0.11 (−0.01 - 0.24) | 0.41 (0.34 - 0.49) | 0.35 (45%) | * |
| RTV | 0.08 (−0.04 - 0.20) | 0.16 (0.05 – 0.27) | 0.72 (0.66 - 0.77) | 0.57 (0.48 – 0.67) | * |
| CE | 0.08 (−0.04 - 0.20) | 0.18 (0.07 – 0.29) | −0.06 (−0.17 - 0.05) | 0.16 (0.05 – 0.27) | 0.73 (0.63 - 0.83) |
Note: In the upper part of the table, the phenotypic correlations are given. In the next quarter, additive genetic estimates (with 95% CIs) of each variable are given in bold on the diagonal. The additive genetic correlations between pairs of variables (with 95% CIs) are given below the diagonal. The contribution of additive genetic factors to the phenotypic correlation between variables is given above the diagonal, with the percentage of the phenotypic correlation that is due to additive genetic effects in brackets. The same information is presented for dominant genetic/shared environmental and child-specific environmental influences in the third and lower quarters of the table, respectively.
It was not possible to formally estimate these proportions, due to the presence of both positive and negative etiological correlations between MRT and CE, and CE and RTV. However, the phenotypic correlation between CE and RTV is 0.12, of which −0.03 is due to A, 0.05 is due to C, and 0.10 is due to E. The phenotypic correlation between MRT and CE is −0.12, of which −0.15 is due to A, 0.06 is due to C, and −0.03 is due to E.