Canadian researchers reviewed nine studies of children born between 22 and 25 weeks of gestation and found that the rates of moderate or severe neurodevelopmental impairment were between 24% and 43%. For every additional week of gestation, the chances of having neurodevelopmental problems dropped, according to the study in the journal JAMA Pediatrics. Despite these significant impairment rates, "the results are not completely bleak in that over half of the children studied did not go on to develop moderate to severe impairment," said Dr. Kimberly Noble, a pediatrician at Columbia University.

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