Autism spectrum disorder has become increasingly common, but why? Two key factors are likely at play here: changes in screening and diagnostic tools and greater awareness.
ASD is diagnosed using criteria from the Diagnostic and Statistical Manual of Mental Disorders (DSM-5). These criteria have changed since previous versions of the DSM, broadening the definition of ASD and likely including children that may have been missed previously, leading to a greater prevalence of autism diagnoses. Also, effective screening tools have made earlier and more accurate ASD identification possible.
Heightened awareness among the general public has likely been a factor in the increased prevalence of autism. Medical professionals are also more watchful for autism today, leading to more screenings, diagnoses, and earlier intervention.