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Correspondence |

Analytical Concerns Regarding Complications of Elective Liver Resections in a Center With Low Mortality

Ashutosh Tamhane, MD, MSPH; Gerald McGwin, MS, PhD
Arch Surg. 2011;146(12):1455. doi:10.1001/archsurg.146.12.1455.
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In their study, Andres et al1 report on the development of a score designed to predict morbidity among patients undergoing liver resection. We have several concerns regarding the statistical analyses described in their study. The first relates to the use of a linear regression model to select variables associated with the occurrence of perioperative complications. Even though the study does not describe how a perioperative complication was operationalized, there are 2 possibilities: (1) it is a count variable (ie, number of complications) or (2) it is a binary variable (ie, 0 vs ≥1 complication). In either case, a linear regression model is not appropriate; rather, a Poisson/negative binomial regression model or a logistic regression model would have been the correct tool, respectively.

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Correspondence

December 1, 2011
Axel Andres, MD; Eric Gerstel, MD, MSc; Pietro Majno, MD; Philippe Morel, MD; Christian Toso, MD, PhD; Gilles Mentha, MD
Arch Surg. 2011;146(12):1455. doi:10.1001/archsurg.146.12.slt110001.
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