The 12.5% come from national statistics, not rural, the figure may be higher in the rural areas and lower in the inner city but the average is 12.5% so can be applied nationwide
I honestly dont' see how you can apply this nationwide. Alot of the population is past, or below child bearing age. And I read (i dont' recall where, but if you really want I'll look it up) that something of the sort of 38% of women and 8% of men are sterilized in china, so you can't apply tihs 12.5%to them, because, it is my opinion that choosing to be sterilized means that you chose NOT to kill your baby by not having a baby at all. You then have to match the 38 some percent of wmen, who probably are married to, or having sex with men who are
not sterilized, which removed another some number of the population from the list of people who allegedly kill their babies, and same with the 8% of men.
Honestly, that 12.5% is bloated by abortion, even if you do not think of abortion as murder, or you do, we are talking about murder after birth aren't we? and it really can't be applied to the population as a whole when you consider all mitigating circumstances
edit:
here's the source.
You may or may not have a problem with a china based website, i assume u'll take it's credibility for what it's worth since we were also taking statistics from CNN.
some interesting stuff here, for instance
China has a decades-long history of family planning. The Chinese Government, since 1979, has encouraged the "one-child" policy to control population growth (rural families and ethnic minorities are permitted to have two children) and contraception has been widely available.
it further goes on to state even more contraceptive methods, so you can't include that population in your 12.5% either
12.5% cannot be applied to the whole.