N

%

Mean ± SD

[range]

Relationship to the child

Mother

74

98.7

Father

1

1.3

Age of subject (years)

75

42.39 ± 5.85

[29 - 56]

Marital status

Married

66

88

Divorced

9

12

Employment status

Employed

13

17.3

Unemployed

62

82.7

Highest level of education

Middle school

1

1.3

High school

28

37.3

Junior college/vocational school

33

44

University or higher

13

17.3

Sleep time (hours)

73

5.48 ± 0.84

[3 - 7]

Chronic symptoms

Present

31

41.3

Absent

44

58.7

Family occupation

Self-employed

10

13.3

Other

65

86.7

Number of cohabiting family members

75

4.01 ± 0.97

[2 - 6]

Living arrangements with grandparents

Living together

9

12

Living apart

66

88

Number of siblings of the child

0

24

32

1

33

44

2

15

20

3

3

4

Life events

Present

33

44

Absent

42

56

Annual household income (million yen)

<3

11

14.7

3 to 5

18

24

5 to 7

31

41.3

7 to 10

6

8

≥10

11

14.7

No answer

3

4

Livelihood

Dissatisfied

11

14.7

Slightly dissatisfied

18

24

Slightly satisfied

31

41.3

Satisfied

13

17.3