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However , by comparing each subgroup to control group , we found statistically significant decreases of TEOAEs amplitudes at 4000Hz for all three groups .
 decreases of TEOAEs amplitudes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 decreases of TEOAEs amplitudes