Hi Gang,

Thanks for your quick reply!

My setup is below. In addition to group, sex and scan site, I have baseline age (age at time 1), and interval (duration between time 1 and time 2) in my model. My specific question is for participants that only have 1 scan - would I leave "interval" blank?

On another note, I'd appreciate your feedback on whether what I have here is appropriate.

Many thanks again,
Lara

3dLME -prefix /path/to/output/output.nii -jobs 6 \
-model 'time*group+age+sex+interscan+site' \
-qVars 'age,interscan' \
-qVarsCenters '12.79,2.1' \
-ranEff '~1' \
-SS_type 3 \
-mask /path/to/mask/mask.nii \
-num_glt 1 \
-gltLabel 1 'grpXtime' -gltCode 1 'group : 1*hc -1*pt time : 1*time1 -1*time2' \
-dataTable \
Subj time group age sex site interscan InputFile \
13649 time1 ctl 13.59 M 1 2.25 13649_GNG_cope2_time3.nii.gz
13649 time2 ctl 13.59 M 1 2.25 13649_GNG_cope2_time4.nii.gz
15388 time1 ctl 11.64 F 2 ??? 15388_GNG_cope2_time3.nii.gz
15341 time1 ctl 12.87 F 3 2.04 15341_GNG_cope2_time3.nii.gz
15341 time2 ctl 12.87 F 3 2.04 15341_GNG_cope2_time4.nii.gz
...
15350 time1 pt 11.69 F 1 2.06 15350_GNG_cope2_time3.nii.gz
15350 time2 pt 11.69 F 1 2.06 15350_GNG_cope2_time4.nii.gz
15398 time1 pt 10.42 F 3 2.07 15398_GNG_cope2_time3.nii.gz
15398 time2 pt 10.42 F 3 2.07 15398_GNG_cope2_time4.nii.gz
15403 time1 pt 12.45 M 2 ??? 15403_GNG_cope2_time3.nii.gz
...