Table 3.
Twin Intraclass and Cross Correlations
| Age 2 | CU | ADHD | ODD | |||
|---|---|---|---|---|---|---|
|
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| MZ | DZ | MZ | DZ | MZ | DZ | |
| CU | .72 (.63–.78) | .41 (.28–.52) | ||||
| ADHD | .49 (.42–.56) | .29 (.18–39) | .74 (.66–.79) | .39 (.25–.50) | ||
| ODD | .52 (.44–.59) | .30 (.19–39) | .55 (.48–.62) | .32 (.21–41) | .72 (.64–.78) | .41 (.28–.52) |
|
| ||||||
| Age 3 | CU | ADHD | ODD | |||
|
|
|
|
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| MZ | DZ | MZ | DZ | MZ | DZ | |
|
| ||||||
| CU | .63 (.52–.71) | .41 (.28–.52) | ||||
| ADHD | .49 (.41–56) | .27 (.16–37) | .78 (.72–.83) | .28 (.13–.41) | ||
| ODD | .44 (.35–.52) | .36 (.25–.45) | .47 (.39–.54) | .28 (.17–39) | .66 (.56–.73) | .41 (.27–.53) |
Note. Intraclass correlations are in bold. Cross-twin, cross-trait correlations are below the diagonal. All correlations are significant at p < .05.