21818
In females , Asians had smaller Tt . Ar than Caucasians ( 16 % , p < 0 . 001 ) , but this difference was not significant after adjusting for covariates .
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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:
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