16933
The average concentration of sum DP in all serum pools was 3 . 6 ng / g lipid weight , ranging from 1 . 4 ng / g lipid weight ( in the 50 - to 59 - yr - old male group ) to 11 ng / g lipid weight ( in the 20 - to 29 - yr - old male group ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None