Hi Douglas,

Thank you very much! Could you please help me with more detailed information?

1)      Should I use “Variables age” or “Variables age weight” in the fsgd file?  If I can use either of them, which one is better?

2)      For the contrast file, the content “1 -1  0” you mentioned, it corresponds to the “Variables age” fsgd file, correct?

3)      If I use the “Variables age weight” fsgd file, what will be the content of the contrast file? Is it “1  -1  0  0”?

Thank you again!

Xiao