Explain historical controls, Advanced Statistics

Historical controls: The group of patients treated in the past with the standard therapy, taken in use as the control group for evaluating the new treatment on the present patients. Though used fairly frequently in the medical investigations, the approach is not to be suggested since possible biases, due to other factors that might have changed over time, can never be satisfactorily removed.

Posted Date: 7/28/2012 7:17:54 AM | Location : United States

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