Table 1 Demographic information at 18 months
Items | 18 months (n = 207) | |
|---|---|---|
n | % | |
Genders | ||
 Boys | 102 | 49.3 |
 Girls | 105 | 50.7 |
Siblings | ||
 0 | 103 | 49.8 |
 1 | 80 | 38.6 |
 2 | 21 | 10.1 |
 3 | 1 | 0.5 |
 No answer | 2 | 1.0 |
Family type | ||
 Nuclear family | 177 | 85.5 |
 Extendend family | 28 | 13.5 |
 No answer | 2 | 1.0 |
Mother’s age | ||
 20–29 | 54 | 26.1 |
 30–39 | 143 | 69.1 |
 40–49 | 10 | 4.8 |
 No answer | – | – |
Father’s age | ||
 20–29 | 36 | 17.4 |
 30–39 | 138 | 66.7 |
 40–49 | 24 | 11.6 |
 50– | 1 | 0.5 |
 No answer | 8 | 3.9 |
Mother’s career | ||
 No | 67 | 32.4 |
 Yes | 114 | 55.1 |
 No answer | 26 | 12.6 |
Family annual income | ||
 < 2 million JPY | 34 | 16.4 |
 2–4 million JPY | 46 | 22.2 |
 4–6 million JPY | 85 | 41.1 |
 6–8 million JPY | 26 | 12.6 |
 8–10 million JPY | 9 | 4.4 |
 ≥ 10 million JPY | 7 | 3.4 |
 No answer | – | – |
Using child care center | ||
 No | 78 | 37.7 |
 Yes | 125 | 60.4 |
 No answer | 4 | 1.9 |