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Twin Intraclass Correlations, and Cross-Twin Cross-Age Correlations
| Univariate Intraclass Correlations |
||
|---|---|---|
| Variables | MZ twins | DZ twins |
| SP age 2 | .67 | .40 |
| SP age 3 | .69 | .38 |
| Cross-Twin Cross-Age Correlations | ||
| SP age 2–SP age 3 | .41 | .37 |
Note. All correlations are significant at p < .001. SP = sleep problems; MZ = monozygotic; DZ = dizygotic.
