4579
INTERPRETATION : The previously reported increase in odds ratio associated with third - generation OCs when compared with second - generation products is likely to have been the result of residual confounding by age .
 Chemical: OCs
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: OCs