NATURE|Vol 441|11 May 2006 BRIEF COMMUNICATIONS ARISING

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CORRIGENDUMSporting contests: Seeing red? Putting sportswearinto contextC. Rowe, J. M. Harris, S. C. RobertsNature 437, doi: 10.1038/nature04306 (2005)

It has been drawn to our attention by DavidMatsumoto and Stephanie Hata that our first-roundanalysis of the Athens 2004 judo competition wasbiased by non-random allocation of blue judogis to asmall number of seeded competitors. Although only25 of 301 contests analysed are affected, theassumptions upon which those analyses were basedwere therefore incorrect. However, their reanalysis(D. M. and S. H., unpublished results), whichexcludes first-round matches, supports ourconclusion that winning biases exist for male judocompetitors wearing blue. Our interpretation ofvisibility-influenced winning biases thereforeremains a valid and plausible alternative to that ofHill and Barton (R. A. Hill and R. A. Barton Nature435, 293; 2005).doi:10.1038/nature04848