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Phenotypic and twin correlations
| Phenotypic | Twin correlations | |||
|---|---|---|---|---|
| Trait | Sleep Duration | MZ | DZ | |
| Animal Naming | r | −0.01 | .393** | .169** |
| N | 5650 | 1167 | 1650 | |
| Block Design | r | −0.03 | .655** | .460** |
| N | 982 | 266 | 225 | |
| Symbol Digit | r | −0.10** | .644** | .350** |
| N | 4498 | 900 | 1349 | |
| Word List | r | −0.05** | .295** | .197** |
| N | 5730 | 1181 | 1676 | |
| Sleep Duration | r | .346** | .188** | |
| N | 1525 | 2001 |
*p < .05, **p < .01.
