3135
After adjusting for multiple confounding factors , men with a serum 25 ( OH ) D concentration of less than 20 ng / mL were associated with an increased risk of vertebral fractures ( OR 7 . 87 ; 95 % CI 1 . 69 - 36 . 71 ) , but not women .
 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