4113
Neurological clinical effects occurred in 6 . 1 % of the patients aged <= 6 years , 13 . 0 % of the patients aged 7 - 12 years and 24 . 6 % of the patients aged > 12 years .
 None
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