Summary of the Survey Results
1. Family Status
(1) Sibling Composition
Over 40% of all the survey subjects had younger sibling(s).
According to changes in the sibling composition, those who were the only child made up 48.8% and elder sibling(s) only 51.2% of all survey subjects in the 1st survey (aged 6 months). In the 6th survey (aged 66 months), those who were the only child made up 16.3% and elder sibling(s) only 41.4%. However, as they had new brother(s) or sister(s) over the years, 42.3% of all survey subjects had younger sibling(s) in the 6th survey (Figure 1).
Figure 1 Changes in the sibling composition
[画像:Figure 1 Changes in the sibling composition]
Note:
The figures are based on the total number of responses to the 1st through 6th surveys, excluding the
replies with "unknown" concerning sibling composition (total number of replies: 35,632).
replies with "unknown" concerning sibling composition (total number of replies: 35,632).