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Subjects' background
| sex (boy / girl) | 7 (47%) / 8 (53%) |
| age (months) | 23.1 (3.4) |
| mother's age (year) | 29.0 (2.9) |
| sibling (yes) | 6 (40%) |
| daily reading book (times/week) | 10.5 (4.4) |
Fifteen young children and their mothers participated in this study.
