2840
At enrollment , mean TrabBMD - Z ( - 0 . 54 +/- 1 . 32 ) was significantly lower ( p = 0 . 0001 ) and CortBMD - Z ( 0 . 73 +/- 1 . 16 , p < 0 . 0001 ) and CortArea - Z ( 0 . 27 +/- 0 . 91 , p = 0 . 03 ) significantly greater in NS versus reference participants , as previously described .
 None
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