5369
The results showed that fecundity decreased to levels similar to those determined in the bioassay after a time of corresponding duration ( 18 . 6 % inhibition compared to the control ) , but the impact then rather weakened until the end of the experiment , at which point the net reproductive rate ( R ( 0 ) ) was still , but not significantly , reduced by 12 . 4 % .
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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