In this study, two groups — one with ASD and one without — are studied for possible links between number of ultrasound scans and developmental disorders. No connection is found.
Problem: The article relies on the number of scans to represent dose. This is a fallacy. As mentioned in a previous post, 5 scans for 5 minutes each and 1 scan for an hour are dramatically different in duration alone. There are many other variables involved.
I conclude that this paper does not confidently prove that antenatal ultrasound is not a possible trigger of autism, and the search continues . . .
We need more research.