23690
With respect to the effects of sex and age on the blood lead , serum creatinine , and serum urea nitrogen levels , data analysis revealed there was a tendency for higher blood lead , serum creatinine , and serum urea nitrogen levels in females than in males , and the levels of blood lead , serum creatinine , and serum urea nitrogen increased among older residents .
 Chemical: creatinine; Chemical: urea; Chemical: nitrogen; Chemical: creatinine; Chemical: urea; Chemical: nitrogen; Chemical: creatinine; Chemical: urea; Chemical: nitrogen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: creatinine; Chemical: urea; Chemical: nitrogen; Chemical: creatinine; Chemical: urea; Chemical: nitrogen; Chemical: creatinine; Chemical: urea; Chemical: nitrogen