Perhaps we shouldn't harbour too many illusions about the success rate of the monitoring. One of the best therapeutic studies, which was published in The Lancet, said that small variations in case definition methods doubled the prevalence.
Those involved in epidemiological studies on autism know that the current definition of phenotype is only slightly more specific than the definition of intellectual disability.
The fact that this category is terribly expansive, as a result of the criteria being insufficiently specific, creates something a false public health problem, since the figures quoted are misleading.