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Reply from the Authors: We appreciate the comments of Tirschwell et al. on our article. Our study was based on hospital discharges during 1992 with the ICD-9 codes 433.× to 436.×; the fifth digit was not included in our analysis because we were unsure how well this coding change would be implemented in its first year. Similarly, our analysis did not address potential variations in coding practices across institutions.
Although we agree that an accuracy rate of 85 to 90% for a particular …
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