4115
Gastrointestinal effects occurred in 4 . 1 % of the patients aged <= 6 years old , 16 . 6 % of the patients aged 7 - 12 years and 13 . 8 % 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