3000
However , clinically significant positive psychotic symptoms ( defined a priori as increases >= 3 points ) were less likely in the CBD group compared with the placebo group , odds ratio ( OR ) = 0 . 22 ( chi (2) = 4 . 74 , p < 0 . 05 ) .
 CBD
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 CBD