What’s in a number? 

Why does it seem so hard to figure out how many people have autism spectrum disorders (ASDs)? Those of us who have followed the various studies over the past 20 years are amazed and sometimes quite confused by the rising prevalence rates. Is there a worsening “epidemic” of autism cases? Are our children getting sicker and sicker? Two studies recently published may provide some clues to this puzzling problem. Before reviewing these new studies, a few words are in order about the dilemmas inherent in the strategies used for counting people with autism. Read full post »