Dear Supreet
I suggest you get very familiar with the GLM and hypothesis testing by reading the Randomise wiki. It is quite straightforward and it will clear most of your questions.
The results depend entirely in the design and contrasts you made. So, what tstat1 and tstat2 mean depends entirely on you.
For example, if the contrast for tstat1 was Patients > Controls, then a significant cluster means the Patients had significantly higher RD or AD values in that particular area of the skeleton. Whereas the contrast Controls > Patients would mean the opposite.
Best regards
Eduardo
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