I am trying to run a VBM analysis (n=20) between healthy controls and patients while controlling for age and gender. I went through the archives and as suggested split the age and gender variables in my design matrix. I ran the same analysis earlier controlling just for age but could not find any significant difference even though I was expecting to. I also demeaned the age for each group. Can anyone please take a look and let me know if I am doing it correctly?
Controls Patients ageControls agePatients genderControls genderPatients
1.000000e+00 0.000000e+00 5.000000e-01 0.000000e+00 1.000000e+00 0.000000e+00
1.000000e+00 0.000000e+00 5.000000e-01 0.000000e+00 1.000000e+00 0.000000e+00
1.000000e+00 0.000000e+00 5.000000e-01 0.000000e+00 1.000000e+00 0.000000e+00
1.000000e+00 0.000000e+00 -5.000000e-01 0.000000e+00 1.000000e+00 0.000000e+00
1.000000e+00 0.000000e+00 -1.500000e+00 0.000000e+00 1.000000e+00 0.000000e+00
1.000000e+00 0.000000e+00 5.000000e-01 0.000000e+00 1.000000e+00 0.000000e+00
1.000000e+00 0.000000e+00 5.000000e-01 0.000000e+00 1.000000e+00 0.000000e+00
1.000000e+00 0.000000e+00 3.500000e+00 0.000000e+00 1.000000e+00 0.000000e+00
1.000000e+00 0.000000e+00 -2.500000e+00 0.000000e+00 1.000000e+00 0.000000e+00
1.000000e+00 0.000000e+00 -1.500000e+00 0.000000e+00 1.000000e+00 0.000000e+00
0.000000e+00 1.000000e+00 0.000000e+00 5.400000e+00 0.000000e+00 -1.000000e+00
0.000000e+00 1.000000e+00 0.000000e+00 -6.000000e-01 0.000000e+00 -1.000000e+00
0.000000e+00 1.000000e+00 0.000000e+00 -1.460000e+01 0.000000e+00 -1.000000e+00
0.000000e+00 1.000000e+00 0.000000e+00 -8.600000e+00 0.000000e+00 -1.000000e+00
0.000000e+00 1.000000e+00 0.000000e+00 -2.760000e+01 0.000000e+00 -1.000000e+00
0.000000e+00 1.000000e+00 0.000000e+00 5.400000e+00 0.000000e+00 -1.000000e+00
0.000000e+00 1.000000e+00 0.000000e+00 1.040000e+01 0.000000e+00 -1.000000e+00
0.000000e+00 1.000000e+00 0.000000e+00 5.400000e+00 0.000000e+00 -1.000000e+00
0.000000e+00 1.000000e+00 0.000000e+00 1.040000e+01 0.000000e+00 -1.000000e+00
0.000000e+00 1.000000e+00 0.000000e+00 1.440000e+01 0.000000e+00 -1.000000e+00
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