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* 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.
* However, a study<ref name="nzmarathon"/> of the 2002 Christchurch Marathon in New Zealand, where aggressive hydration was not recommended, none of the 134 runners measured had Hyponatremia.
==Risk Factors==
The study<ref name="ref12"/> revealed that the risk factors for Hyponatremia in marathons include
<ref name="Houston">Hew TD, Chorley JN, Cianca JC, et al. The incidence, risk factors and clinical manifestations of hyponatremia in marathon runners. Clin J Sports Med. 2003;13:41–47 http://www.ncbi.nlm.nih.gov/pubmed/12544163</ref>
<ref name="nzmarathon">Study of hematological and biochemical para... [Clin J Sport Med. 2004] - PubMed - NCBI http://www.ncbi.nlm.nih.gov/pubmed/15523206</ref>
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