The K-D test is relevant to any sporting activity in which there is likely to be physical contact between players or there is a chance of head injury or collision. In addition to football, soccer, and lacrosse, its use has been tested in sports such as boxing (Neurology 2011;76:1456-62), basketball (J. Neurol. Sci. 2011;309:34-9), ice hockey (J. Neurol. Sci. 2013;328:28-31), and rugby (J. Neurol. Sci. 2013;326:59-63).
The study was partly supported by the National Institutes of Health. Dr. Balcer declared no relevant conflicts of interest.