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Patients undergoing knee surgery provided accurate ratings of preoperative quality of life and function 2 weeks after surgery
When reporting the results of clinical trials comparing two interventions, investigators often describe patients’ baseline health status to illustrate pretreatment similarity between groups. As well, these data often provide a covariate for statistical comparisons between groups to control for any differences that were present before treatment commenced and to thus increase the power to demonstrate the intervention effect.
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