21452
Baseline characteristics of the two study groups were similar with the exception of BMI , which was slightly higher among the cases ( 22 . 9 +/- 3 . 9 versus 21 . 9 +/- 3 . 3 Kg / m2 , p = 0 . 013 ) .
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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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