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Review Question - QID 217978

Statistic Definitions QID: 217978 (SBQ21SM.40)
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QID 217978 (Type "217978" in App Search)
A multicenter prospective study of 6,300 patients that assesses differences in re-rupture rates after rotator cuff repair with and without 6 weeks of immobilization shows a decreased rate of re-rupture with longer immobilization. A follow-up study done at a single institution of 150 patients fails to show any difference in re-rupture rates based upon the duration of immobilization. If the multicenter trial is assumed to be accurate, which statistical error occurred in the follow-up study?
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