Of the 60 people who answered in the General Social Survey that they had been Orthodox Jews at age 16, more than 70% identified as non-Orthodox at the time of the survey. For all the talk about Conservative and Reform attrition, it looks like Orthodox attrition is higher, although they no doubt make up for it by increased birth rate.
I can think of any number of reasons why people who are still Orthodox Jews are underrepresented in this study, and it's a shame that N is so small, but I've had a hard time finding good data on this subject. I think it's interesting stuff.
