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Frequency of left-handers in families, according to maternal/paternal handedness and the sex of the offspring. (Combined results, adapted from McManus (1991). Numbers in parentheses indicate sample sizes (total 64 582). L, left; R, right.)
| parental handedness | left-handed offspring | ||
|---|---|---|---|
| father | mother | sons | daughters |
| R | R | 10.4% (30 268) | 8.5% (26 020) |
| R | L | 22.1% (1815) | 21.7% (1688) |
| L | R | 18.2% (2308) | 15.3% (2100) |
| L | L | 27.0% (215) | 21.4% (168) |
