Table 4.
Twin Correlations and Univariate Genetic Models for Sensory Over-Responsivity (SOR) and Temperament Variables
| Twin Correlations | Variance Components | Model Fit | Model Difference | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| rMZ | rDZ | h2 | c2 | d2 | e2 | AIC | BIC | Δ χ2 | Δdf | p | ||
| Auditory SOR | 0.70 | 0.47 | ACE | 0.62 | 0.12 | -- | 0.26 | 1775.83 | −4727.65 | |||
| AE | 0.75 | -- | -- | 0.25 | 1778.15 | −4729.01 | 4.31 | 1 | 0.038 | |||
|
| ||||||||||||
| Tactile SOR | 0.67 | 0.45 | ACE | 0.44 | 0.20 | -- | 0.36 | 1810.46 | −4701.81 | |||
| AE | 0.66 | -- | -- | 0.34 | 1818.34 | −4700.38 | 9.88 | 1 | 0.002 | |||
|
| ||||||||||||
| Negative Affect | 0.73 | 0.44 | ACE | 0.59 | 0.15 | -- | 0.27 | 22.93 | −5048.28 | |||
| AE | 0.74 | -- | -- | 0.26 | 26.32 | −5049.06 | 5.39 | 1 | 0.02 | |||
|
| ||||||||||||
| Effortful Control | 0.75 | 0.30 | ADE | 0.75 | -- | 0.00 | 0.25 | 692.78 | −4715.83 | |||
| AE | 0.75 | -- | -- | 0.25 | 690.78 | −4719.30 | 0.00 | 1 | 1 | |||
|
| ||||||||||||
| Fear | 0.70 | 0.26 | ADE | 0.69 | -- | 0.00 | 0.31 | 188.76 | −4967.84 | |||
| AE | 0.69 | -- | -- | 0.31 | 186.76 | −4971.31 | 0.00 | 1 | 1 | |||
Notes: Twin correlations are intraclass correlations, with N = 349 for monozygotic (MZ) twin pairs and N = 679 for same-sex and opposite-sex dizygotic (DZ) pairs. For all correlations, p ≤ .001. N = 1033 twin pairs for the univariate analyses. A and h2 denote additive genetic effects, D and d2 denote dominant (non-additive) genetic effects, C and c2 denote shared environmental effects, and E and e2 denote unique environment effects.