| Summary: | This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/about/our-business/policies/article-withdrawal).After publication of this article, concerns were raised about the validity of the study design and conclusions reported. Following a post-publication assessment involving editor members of our Editorial Board, the International Journal of Gerontology Editors decided to retract this article due to the study design, methodology, and interpretation of the data, which the peer review process did not adequately address such that the results of the study were determined to be unreliable. Issues include:1. The study had no IRB approval and informed consent from patients.2. The authors did not report a power calculation to support the sample size and demonstrate it was adequate to assess the outcomes of laparoscopic cholecystectomy.3. Further concerns were raised about the statistical analysis methods and reporting: the authors did not report a statistical analysis plan and methodology clearly in their Methods section. The authors did not state how to choose variables to adjust in the multivariate analysis. In the statistics analysis section and tables, the authors did not list the variables which have been adjusted for. It makes the results difficult to interpret.4. In Table 2 the authors incorrectly interpreted the results by considering that OR<1 for the association between post-operative operation and prolonged hospitalization in the text.5. The data in the table 1 and table 2 are inconsistent, for example, it is stated in table 1 that elder patients had longer hospital stay. But in table 2, elder patients were associated with short hospital stay.In light of the above concerns about the study design and methods used, the International Journal of Gerontology Editors consider that the conclusions of this study are not supported by the data presented and retract this article.
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