What important aspect of the adoptive family was missing from early studies? What did later studies find when they included it?

What will be an ideal response?

Early studies did not examine the child-rearing adequacy of the adoptive family. Later studies found that communication deviance-how understandable and easy to follow the speech of family members was-was related to risk of schizophrenia. Children with a biological risk for schizophrenia who were adopted into families with high communication deviance had an increased risk of the disease. If the child had no genetic predisposition for schizophrenia, communication deviance did not make a difference in risk. Most interesting, if a genetic risk existed and the child was adopted into a family with low communication deviance, that child's risk for schizophrenia was actually lower than the other groups'! GRADING RUBRIC: 10 points total, 5 for missing information from early studies and 5 for identifying what later studies concluded.