CNN The Lead With Jake Tapper March 20, 2013 20:10:00
We've known this for quite sometime. numbers have varied but the fact remains the same. autism is extremely common. >> the survey indicates that there was something like a 23% response rate. now it seems to me, i'm no doctor, but those parents who have children with autism would be very eager to participate and those who are not as invested might not be. is it common to survey children this way? >> well, you know, the numbers we get are direct results of the ways we go about counting children with autism. the number we saw last year was really as you said before based on educational record rev...