1772
RESULTS : The sensitivity improved dramatically from 16 % to 79 % , positive predictive value increased from 60 % to 68 % and negative predictive value from 54 % to 78 % , and specificity decreased from 90 % to 67 % .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 None