A study from Thailand looked at applying 1.3 ATA to autistic children. They pre-assessed them before and after treatment after only 10 dives. Significant improvements were shown for 75% of the children.

Objective: To determine whether Hyperbaric Oxygen Therapy is safe to use in children with autism, and has a statistically significant effect on autistic symptoms. This is the first study in Thailand.

Material and method: Thai Autistic children (n = 7) received HBOT (1.3 atm., 10 sessions) treatment. Assessment was done before and after treatment in five domains: Social development, Fine motor and Eye-hand coordination, Language development, Gross motor development, Self-help skills.

Results: Improvement was shown in five domains with a significant level.

Source to study:

https://pubmed.ncbi.nlm.nih.gov/18788696/