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		| Originally posted by Tyrone Slothrop My sister, BTW, figured 5% seemed about right.
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  FWIW, I recall another way to calculate it - one abortion for every 2.3 (I think) live births.  I am not willing to expend the effort to even do back of the envelope calculations, but my gut is that the 5% number doesn't sound high.  
Now you can have fun figuring out what the fact that women are fertile for, on average, about 25 years (15-40) means if 5% of them are having abortions each year.  My vague recollection is hearing that (after controlling for repeat customers) somewhere between 1/3 and 1/2 of all women in America have had or will have an abortion at some point.  I have no frickin' clue how they calculate that, though it seems most interesting to me in what it says about how many women are, in fact, repeat customers.  
BR(I'd also love to see regressions of those repeats for (i) education, (ii) income and (iii) religious affiliation)C