Maybe an asymptotic ratio, hard to get lower than zero or higher than 32
But Socioeconomic status is a strong predictor for tooth loss
http://en.wikipedia.org/wiki/Teeth http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1360976
Hmmm, that didn’t work
There, that’s better
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1360976