18983
Results : NHANES median UI concentration in 2009 - 2010 ( 144 micro g / L ) was significantly lower than in 2007 - 2008 ( 164 micro g / L ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None