Can I take your number? quality meds delivery Other scientists are skeptical. Based on his own calculations using numbers provided in the study, "it looks to me like only 16.5% of the time will a positive value actually predict autism," if one takes into account the low prevalence of autism in the general population, says George Anderson, a neuroscientist at Yale University. "I'm amazed that they're going ahead at this point and trying to commercialize a test—this needs to be replicated several times."