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Summary of subjects’ demographic information
| Zygosity | Number of twin pairs | Gender | Age (mean ± SD) | IQ (mean ± SD) | |
|---|---|---|---|---|---|
| Number of males | Number of females | ||||
| MZ | 32 | 30 | 34 | 15.7 ± 1.5 | 122.3 ± 14.7a |
| DZ | 24 | 22 | 26 | 16.0 ± 1.5 | 125.0 ± 14.6 |
IQ scores of one MZ twin pair were not measured.
