Blue Judogis may Bias Competition Outcomes

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  • ブルーの柔道着は競技結果に影響をもたらすか

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In this study we investigated the existence of a win bias in judo competition as a function of judogi color. We analyzed the results of four major international competitionsthe 2001,2003, and 2005 World Championships, and the 2004 Athens Olympic Gamesin terms of whether or not athletes were more likely to have won their matches when wearing the blue judogi. The results indicated a statistically significant bias in winning percentage for male athletes who wear the blue judogi, but not for females. This bias increased within a tournament from beginning to end, and across years.

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