30476
We applied a twin regression analysis ( Inference on Causation by Examination of Familial Confounding ; ICE FALCON ) to assess consistency with a causal component in the association between a predictor ( X ) and an outcome ( Y ) by testing if the regression coefficient for the X value of the co - twin decreases after adjusting for the X value of the twin herself .
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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:
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