we know that dependent variable is a variable whose value changes by changing the independent variable, but independent variables are not changed by changing dependent variable values.
it is given that we have to study whether requiring an intrOprTive blood transfusion impacted post operative rates of poor mental health
So, in this case, dependent variable is post operative rates of poor mental health because it is dependent on the intrOprTive blood transfusion
therefore, independent variable is intrOprTive blood transfusion
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