Table 1

The definition of variables and statistical description
Variable Sample size Mean Standard deviation Nature/measure Definition of variables
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

Wang et al.

Wang et al. BMC Public Health 2013 13:217   doi:10.1186/1471-2458-13-217

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