How many kids have autism? US government measures 3 ways

How many American children have autism? The U.S. government answers that question at least three different ways and says the latest estimate — 1 in 40 kids — doesn't necessarily mean the numbers are rising.The new number, published Monday in Pediatrics , is from one of three periodic surveys the government uses to assess autism rates. It's higher than a different survey's estimate published earlier this year, but the surveys use different methods and measure different populations of