Table 1 Demographic characteristics

Sex

 Male

65.5

51.6

73.3

86.0

 Female

34.5

48.4

26.7

14.0

Age

 18‐19 years

9.3

12.1

8.2

6.5

 20‐29 years

55.6

55.6

55.4

53.7

 30‐39 years

16.1

17.0

15.4

15.1

 40‐49 years

9.1

6.0

11.3

12.9

 50‐59 years

7.3

6.5

8.2

7.5

 ≧60 years

2.6

2.8

1.5

4.3

Education level

 Elementary and junior high school

1.1

0.8

0.5

3.2

 High school (equivalent test)

10.5

8.1

12.8

12.9

 Junior and career college

8.9

10.1

10.8

3.2

 University student

37.3

39.9

34.4

32.3

 Graduation from univerisity

26.7

27.4

24.1

31.2

 Graduate student

12.3

9.7

15.9

11.8

 Graduation from graduate school

3.2

4.0

1.5

5.4

Annual income

 <1,000,000 JPY

52.4

55.6

51.8

45.2

 1,000,000 - 1,999,999

6.3

5.6

6.7

7.5

 2,000,000 - 2,999,999

9.9

12.1

7.7

8.6

 3,000,000 - 3,999,999

10.6

11.3

10.3

9.7

 4,000,000 - 4,999,999

6.7

6.0

6.2

9.7

 5,000,000 - 5,999,999

4.5

3.2

5.6

5.4

 6,000,000 - 6,999,999

3.2

1.2

3.6

7.5

 7,000,000 - 7,999,999

3.0

2.0

4.6

2.2

 8,000,000 - 8,999,999

0.9

0.8

1.0

1.1

 9,000,000 - 9,999,999

1.1

1.2

1.0

1.1

 ≧10,000,000

1.3

0.8

1.5

2.2

Marital status

 Married

27.6

23.4

31.3

31.2

 Experience of divorce

1.9

1.2

1.5

4.3