THE EXPERT TESTIMONY OFFERED TO DEMONSTRATE A CAUSAL RELATIONSHIP BETWEEN LOW-BIRTH-WEIGHT AND AUTISM SHOULD HAVE BEEN PRECLUDED; NEW TRIAL ORDERED (SECOND DEPT).

The Second Department, reversing the plaintiffs’ verdict in this medical malpractice action and ordering a new trial, determined the expert testimony offered to demonstrate low-birth-weight has a causal relationship with autism should have been precluded:

There was no testimony at the Frye hearing that any of the studies Rubenstein [plaintiffs’ expert] relied upon concluded that premature birth causes autism. Rather, Rubenstein’s testimony established that the exact mechanism of how autism develops is unknown and that studies found a causal inference or association between prematurity and autism, not a causal relationship. Further, there was no testimony elicited at the Frye hearing that demonstrated that the medical community, specifically pediatric neurologists, have accepted that prematurity causes autism or even that a child’s birth at 25 weeks versus 27 weeks increases that child’s risk of later being diagnosed with autism. In any event, the gap between the statistical analysis relied upon by Rubenstein regarding the prevalence of autism in preterm, low-birth-weight infants and his testimony that the pathophysiology and causes of autism are unknown was too great to allow him to opine as to his theory of causation in this action. Based upon the foregoing, the Supreme Court erred in denying that branch of the defendants’ motion which was to preclude Rubenstein’s testimony on this theory of causation. Terehoff v Frenkel, 2026 NY Slip Op 02688, Second Dept 4-29-26

Practice Point: Consult this decision for insight into when observational studies will not support an expert’s testimony about causation. Here the testimony purporting to link low-birth-weight to autism should have been precluded.