2375
The pain visual analog scale ( VAS ) mean difference was 0 . 73 ( confidence interval [ CI ] 0 . 35 , 1 . 10 ) for early ( < 12 weeks ) and 0 . 58 ( CI 0 . 19 , 0 . 97 ) for late time points ( 6 to 12 months ) , favoring vertebroplasty ( p < 0 . 001 ) .
 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