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Demographic characteristics of the MZ and DZ twins
| MZ twins | DZ twins | |
|---|---|---|
| Age (years) | 11.9 (2.7) | 9.89 (2.8) |
| SES (Hollingshead) | 42.9 (16.1) | 34.9 (13.1) |
| Writing hand (% right) | 83% (41/47) | 92% (22/24) |
| Writing hand concordance | 74% (17/23) | 83% (10/12) |
Writing hand information missing for one MZ twin.
