5003
Obese boys had a significantly larger effect than obese girls ( relative risk , boys : 2 . 47 ; 95 % CI , 1 . 57 - 3 . 87 ; girls : 1 . 25 ; 95 % CI , 0 . 51 - 3 . 03 ) , with significant dose - dependent effect .
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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