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Earliest diagnosis of ADHD or Autism in adulthood, 2016 to 2025

Data on the number of people with an earliest recorded diagnosis of ADHD or Autism in adulthood from 2016 to 2025.
Date published:
7 January 2026

Request received

Request received for statistics and or data on the number of individuals diagnosed with ADHD or Autism who were diagnosed in adulthood (18 and over).

Our response

In response we have provided data on the number of people with an earliest recorded diagnosis of ADHD or Autism from the Mental Health Services Dataset (MHSDS) and the Community Services Dataset (CSDS). Information is available in MHSDS from January 2016 and from CSDS from October 2017.

Download the data

Last edited: 7 January 2026 2:59 pm