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
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