Table 3 Univariate and multivariate analyses for factors related to fertility knowledge in the General group

Socio-demographic

 Gender

Male

40.6 (23.6)

Reference

Female

48.2 (21.9)

<0.001

6.54

4.95 to 8.15

<0.001

 Age

Each additional year older

-0.02^b

0.16

-0.13

-0.21 to -0.06

<0.001

 Annual household income

< 4 million JPY

43.2 (22.4)

Reference

4 - 7 million JPY

45.9 (22.9)

1.43

-0.28 to 3.15

0.10

≥ 8 million JPY

47.0 (23.8)

<0.001

2.57

0.34 to 4.79

0.024

 Educational level

No university education

42.4 (22.8)

Reference

University education

47.1 (23.2)

<0.001

3.33

1.73 to 4.93

<0.001

 Marital status

Never married

41.7 (23.2)

Ever married

46.0 (22.8)

<0.001

Fertility

 Whether or not given birth

Not given birth/fathered a child

43.2 (23.8)

Reference

Given birth/fathered a child

45.7 (22.3)

<0.001

0.84

-0.79 to 2.47

0.31

 Whether or not currently trying to conceive

Not currently trying to conceive

43.6 (22.9)

Reference

Currently trying to conceive

54.7 (22.8)

<0.001

6.54

3.62 to 9.46

<0.001

Health-related skills and behaviour

 Smoking status

Non-smoking

45.4 (23.2)

Reference

Smoking

40.2 (22.2)

<0.001

-2.29

-4.12 to -0.45

0.015

 The score of HLS-14

each additional score higher

0.24^c

<0.001

0.52

0.41 to 0.63

<0.001

 The score of the Lipkus-J

each additional score higher

0.10^c

<0.001

0.90

0.54 to 1.27

<0.001