Table 1 The definition of variables and statistical description

Have you attended for the premarital screening?

630

0.35

0.477

Nominal

1=yes,0=no

Gender

632

0.44

0.497

Nominal

1=male,0=female

Age

631

27.90

5.387

Scale

Min=20, max=58

Residence

632

N/A

N/A

Nominal

0=else,1=Wuhan,2=Suizhou,3=Zaoyang

Ethnicity

632

0.97

0.162

Nominal

1=Han,0=else

Profession

633

N/A

N/A

Nominal

0=common clerks, 1=leaders, 2=scientists and teachers, 3=farmers

Education

633

3.20

1.199

Ordinal

1=junior middle school and below,2=senior middle school,3=junior college,4=college,5=graduate and above

Monthly income

633

3.08

1.107

Ordinal

1=below 800 yuan

2=800-1500 yuan

3=1500-2500 yuan

4=2500-5000 yuan

5=above 5000 yuan

Awareness of PMS

633

0.93

0.257

Nominal

1=aware,0=not aware

Awareness of the free and voluntary mode

633

0.60

0.490

Nominal

1=aware,0=not aware

Knowledge level of PMS

633

2.84

0.844

Ordinal

1=unknown, 2=know a little, 3=know generally,4=know fairly well, 5=know well

PMS items knowledge score

621

54.61

10.686

Scale

Min=14, max=70

Attitude to the necessity of PMS

630

3.65

0.644

Ordinal

1=not necessary at all,2=unnecessary,3=a little necessity,4=very necessary

Attitude to the preventive effects of PMS

631

2.54

0.533

Ordinal

1=makes no difference, 2=general effect, 3=has considerable effect