The composition of elder and younger siblings who live with the surveyed child
If the surveyed child is one of twins or triplets, and does not have other siblings, he/she is categorized in the group of gelder sibling(s) only.h
If the surveyed child has siblings whose ages are unknown, such siblings are categorized as gelder siblingsh if they have been counted since the 1st survey.
| Only child | The surveyed child only |
| Younger sibling(s) only | The surveyed child plus younger brother(s) and/or sister(s) |
| Elder sibling(s) only | The surveyed child plus elder brother(s) and/or sister(s) |
| Both elder and younger siblings | The surveyed child plus elder brother(s) and/or sister(s) and younger brother(s) and/or sister(s) |
Usual caregivers
Those who take care of the subject child on a daily basis, regardless of the number of hours
| Nurses, etc. at nursery schools | Includes nurses at authorized and unauthorized (e.g. baby hotels) nursery facilities |
| Nursery mothers | A collective name for those authorized by local governments, in order to take care of a small number of infants at home. Also ghome welfare workersh and gnursery rooms at homeh |
| Baby sitters | Those who take care of infants at the infantsf homes |
| Nurses, etc. | Incl. gNurses, etc. at nursery schools,h gNursery mothersh and/or gBaby sittersh |
1st, 2nd, 4th and 5th surveys:
Total number of full-time workers, part-time workers, self-employed workers, family workers, pieceworkers at home, and others
3rd survey:
Those engaged in work with income, or with the intention of receiving income
gSatisfaction from child rearingh and gburdens and worries about child rearingh are in regard to the surveyed children.
Expenditures for the surveyed children for a period of one month; in July 2005 for those who were born in January and in January 2006 for those who were born in July
gBurden of child-rearing expendituresh is in regard to the expenses for the surveyed children.