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CONCLUSION : The use of light propofol sedation decreased the prevalence of postoperative delirium by 50 % compared with deep sedation .
 Chemical: propofol; Disease: postoperative delirium
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: propofol; Disease: postoperative delirium