21454
Conversely , the clinical pregnancy rate per started cycle , the implantation rate and the live birth rate per started cycle did not differ ; they were 36 % and 34 % ( p = 0 . 93 ) , 28 % and 22 % ( p = 0 . 11 ) and 30 % and 27 % ( p = 0 . 50 ) in cases and controls , respectively .
 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