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To the Editor:
I read with interest the recent article by Carr et al.1 I found it interesting and well done, but I have several questions about the calculations, which seem to have several (apparently minor) errors. In the table there are at least two errors, and in the text there is an apparent error (if the table is correct or approximately correct). I do not believe that these errors change the results or conclusions significantly, but they do warrant clarification and presumably an erratum (if the authors agree with the concerns).
In the “CDR-0.5” column, the value “84.1%” is impossible. There cannot be both “84.2%” and “84.1%” with a sample size of 165, because these percentages imply a difference …
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