880
Such factors as sex ( female ) , age ( > or = 60 years old ) , and the ribavirin dose by body weight ( 12 mg / kg or more ) were significant by univariate analysis .
 Chemical: ribavirin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: ribavirin