Key result
Estimating restenosis rates using repeat angiography is subject to selection bias because patients are preferentially referred on the basis of recurrent symptoms.
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Design
Editorial
Discusses the methodological challenge of selection bias when estimating restenosis rates based on repeat angiography.
Kuntz et al' correctly note that patients referred for repeat angiography are preferentially selected on the basis of recurrent
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G A Diamond (1993) studied this question. Estimating restenosis rates using repeat angiography is subject to selection bias because patients are preferentially referred on the basis of recurrent symptoms.
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