Although recent studies have found that head injuries occurring between the ages of 11 and 14 increase the risk for schizophrenia by 65%, what was a noted limitation to this finding?
A. There is a possible confounding effect of the emotional stress caused by the head injury.
B. The sample size was too small to make a strong conclusion.
C. Factors such as risk for comorbid psychological disorders were not properly controlled for.
D. Genetic vulnerability was not taken into account.
Answer: A
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