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Longitudinal Aspect of Case-Control Analysis—Reply

David R. Friedland, MD, PhD; Christina Runge-Samuelson, PhD
Arch Otolaryngol Head Neck Surg. 2010;136(11):1150. doi:10.1001/archoto.2010.177.
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We appreciate the comments of Vogtmann and colleagues regarding our article “Case-Control Analysis of Cochlear Implant Performance in Elderly Patients.” However, we maintain that characterizing the principal component of our study as a case-control analysis, the results of which are shown in Figures 3 and 4 in our article, is appropriate, and, as such, the statistical analyses are also correct. The description of this component of the study as “longitudinal” is incorrect and may account for the suggestion that our analysis represents a cohort study. Our study measured a single outcome (speech perception) at a single time point (1 year after implantation) among patients who were stratified by elderly (case) and nonelderly (control). To ensure equivalency of initial residual hearing, these patients were retrospectively matched by 1 measure of speech perception at initial presentation. We stand by our conclusion that elderly patients do very well with cochlear implantation but that outcomes are more variable and less robust than in younger adults.

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