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A difficult birth or a history of mental illness in a parent may put a baby at greater risk for autism. The Centers for Disease Control and Prevention said that in a study of 698 Danish children with the developmental disorder, researchers found a disproportionately high number had been born before the 35th week of pregnancy, had suffered from low birth weights and were in a breech position at birth. The children, all of whom were born after 1972 and diagnosed with autism before 2000, also were more likely to have a parent who had been diagnosed with schizophrenia-like psychosis before the autism was discovered.
-What type of study is this?
A) A prospective observational study
B) A retrospective observational study
C) A case-control study
D) An experiment

Question

Quizplus · Accepted Answer

This is a retrospective observational study because it looks back at past records (children born after 1972 and diagnosed before 2000) to examine the association between certain risk factors (e.g., birth conditions, parental mental illness) and autism.

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