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* In a 1997 Ironman triathlon, almost 4% of competitors received attention for Hyponatremia <ref name="ref4"/>.
* In a study of the 2002 Boston Marathon, 13% of finishers had some level of Hyponatremia, and 0.6% had critical Hyponatremia <ref name="ref2"/>.
* In the Houston marathon<ref name="Houston"/>, 21 runners who received medical help were suffering from Hyponatremia. Runners with Hyponatremia were generally slower and drank more.
==Risk Factors==
The study<ref name="ref12"/> revealed that the risk factors for Hyponatremia in marathons include