7971
Juveniles per cocoon between all of the different treatment groups were ; control ( 2 . 83 +/- 0 . 54 ) > site 2 ( 20 years old ; 1 . 83 +/- 0 . 27 ) > sites 1 and 3 ( 40 years old ; 1 . 06 +/- 0 . 15 and 6 years old ; 0 . 88 +/- 0 . 39 ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None