TABLE 1.
DeFries-Fulker Extremes Analysis of CU Traits in Children With Elevated Levels of CU Traits (CU+) and in Children With Elevated Levels and Anxiety (ANX/CU+)
| Proband Standardized M (SD) | Co-Twin Standardised M (SD) | Transformed Co-Twin M | h2g | c2g | |
|---|---|---|---|---|---|
| CU+ (N = 627) | |||||
| MZ Twins | 1.96 (0.57) | 1.42 (.98) | .73 | .75 (.58 to .92) | −0.02 (−1.22 to 2.38) |
| DZ Twins | 2.02 (0.60) | 0.71 (1.16) | .35 | ||
| ANX/CU+ (N = 119) | |||||
| MZ Twins | 2.03 (0.63) | 1.45 (0.99) | .72 | .66 (.33 to .95) | .05 (−1.62 to 2.28) |
| DZ Twins | 1.98 (0.59) | 0.77 (0.84) | .39 |
Note: CU = callous-unemotional; ANX = anxiety; MZ = monozygotic; DZ = dizygotic.