Hi Tanja, you should use DODS and test for a difference between the age slopes of the groups (ie, an interaction between group and age). If there are no significant interactions, you should then use DOSS to test for the difference between thicknesses. doug

Tetiana Dadakova wrote:

Dear all,

I have two groups of subjects, and I want to see a difference in thickness between them controlling for age. I couldn't find any information in the literature on how the subject's brains in my groups develop with age. Therefore I can't tell whether thickness as a function of age for both groups has the same slope or different.

My question is if in this case I should use DODS?

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