1901
RESULTS : The incidence of pain was significantly lower in Groups R4 and R6 than in the control and R2 groups ( 12 / 32 and 6 / 31 vs 26 / 31 and 25 / 32 , respectively , P < 0 . 001 ) .
 Disease: pain
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:
 Disease: pain