7282
Malformation rate was higher among 236 pregnancies exposed before 12 gestational weeks ( 4 % ) than in 255 controls ( 1 . 8 % ) , although not statistically significant ( OR = 2 . 2 [ 95 % CI = 0 . 6 - 7 . 7 ] ) .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None