1922
164 patients ( mean age + / - standard deviation [ SD ] 81 . 6 + / - 6 . 8 years ) were admitted .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities:  
Answer:
 None