From the Wikipedia page
> In June 2005, the Chief Coroner of Ontario ordered a review of 44 autopsies carried out by Smith. Thirteen of these cases had resulted in criminal charges and convictions. The report was released in April 2007, indicating that there were substantial problems with 20 of the autopsies.
That sounds more like 45% to me.
Also this bit from the article about a baby that allegedly had a skull fracture:
> Later exhumation of the child and examination of the skull have shown that there was no skull fracture. It is thought Dr. Smith confused the normal gap between the baby's skull plates for an injury.
Holy shit that is bad. Even as a lay person I know about these gaps.