5030
Regression analysis indicated that for each natural log unit increase in p , p ' - DDT , birth weight increased by 274 g ( 95 % CI : 122 , 425 ) when controlling for p , p ' - DDE and o , p ' - DDT .
 p , p ' - DDT, p , p ' - DDE, o , p ' - DDT
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 p , p ' - DDT, p , p ' - DDE, o , p ' - DDT