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Men with a serum 25 ( OH ) D concentration greater than 30 ng / mL showed a lower prevalence of vertebral fractures compared to those with 20 - 29 . 9 ng / mL or those with less than 20 ng / mL ( 9 . 4 % vs . 17 . 9 % vs . 21 . 7 % , p for trend = 0 . 036 ) .
 Chemical: 25 ( OH ) D
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: 25 ( OH ) D