A slight rise was not found to be significant
Interestingly enough, the study found that the prevalence of autism was relatively steady during their reporting period of 3 years. In 2014, the incidence was about 2.24%. Just one year later, the incidence was only slightly increased at 2.41%, and at 2 years later, it was again only slightly increased at 2.76%. The study authors found that these slight increases were not statistically significant after analysis, meaning that we can't tell whether the rise is truly an increase in autistic children being diagnosed or whether it's a simple matter of random fluctuations.