18806
Five integrative biomarker indices are compared : Bioeffects Assessment Index ( BAI ) , Health Status Index ( HSI ) , integrated biological response ( IBR ) , ecosystem health condition chart ( EHCC ) and Integrative Biomarker Index ( IBI ) .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None