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Participant characteristics by cultural group and age.
| Age group | Cultural group | N (female) | Mean age (range) |
|---|---|---|---|
| 10 months | British | 26 (10) | 307 days (288−330 days) |
| Japanese | 22 (11) | 306 days (289−323 days) | |
| 16 months | British | 26 (11) | 474 days (446−507 days) |
| Japanese | 15 (5) | 481 days (449−534 days) | |
| Adults | British | 31 (16) | 27.35 years (19−40 years) |
| Japanese | 30 (17) | 21.73 years (18−31 years) | |
