Shafaqna English- Researchers say the sharp rise in autism diagnoses over recent decades is likely driven largely by changes in detection, diagnostic criteria and who receives assessments, rather than a clearly established increase in the underlying occurrence of autism, according to PsyPost.
Studies from the US, UK, Sweden, Australia and South Korea show substantial increases in recorded diagnoses, particularly among adults, females and people with less severe presentations.
A South Korean study that used the same screening methods across 12 birth cohorts found autism prevalence remained broadly stable at about 2–3%, while more children moved from being undiagnosed to diagnosed. Other research has linked rising diagnoses to expanded criteria, diagnostic substitution and changes in healthcare and funding systems.
Researchers also recognise potential biological contributors. Advanced parental age, maternal obesity and gestational diabetes have been associated with higher autism risk, while studies of environmental pollutants have reported possible links but generally rate the evidence as low or very low certainty.
Importantly, major reviews have found no association between vaccines and autism. Scientists say current evidence cannot determine whether there has been any change in the underlying biological incidence, and further research using consistent screening methods is needed.
Source: PsyPost