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November 2015

Duplicate Data Inadvertently Included in the Meta-analysis

JAMA Pediatr. 2015;169(11):1072. doi:10.1001/jamapediatrics.2015.3522

In the article titled “Breastfeeding and Childhood Leukemia Incidence: A Meta-Analysis and Systematic Review,”1 the authors incorrectly included a study in the meta-analysis with cases and controls that were included in another study that had been published previously and was also included in the meta-analysis. The meta-analysis was reconducted without the second study and duplicate data, and corrections were made to the Abstract, text, references, tables, and figures of the original article. These corrections did not affect the direction of the main results, interpretations, or conclusions of the meta-analysis, and this article has been corrected online.2 A previous correction about this article was also published.3

Amitay  EL, Keinan-Boker  L.  Breastfeeding and childhood leukemia incidence: a meta-analysis and systematic review [published online June 1, 2015. Last corrected online November 2, 2015].  JAMA Pediatr. 2015;169(6):e151025.PubMedGoogle ScholarCrossref
Amitay  EL, Keinan-Boker  L.  Breastfeeding and childhood leukemia incidence: duplicate data inadvertently included in the meta-analysis and consideration of additional potential unmeasured confounders—reply.  JAMA Pediatr. doi:10.1001/jamapediatrics.2015.2643.Google Scholar
 Incorrect and misleading data [correction].  JAMA Pediatr. 2015;169(8):791.Google Scholar