This compares to a background population risk of 0.4 %. (sciencedaily.com)
Is the risk for premature birth so incredibly high that it moves the whole population risk figure by such a factor — or is it that there are that many premature births? (skepticalob.com)
The researchers also determined that rare inherited gene variations — those found in less than 5 % of people — contribute another 3 % of autism population risk. (protomag.com)