I have collected data at five time points and would like to figure out
if there is a difference from baseline (T1) at the later visits (e.g.
T1->T2; T1->T3; T1->T4; and T1->T5).  I am trying to figure out which
procedure to use in SAS and am stuck.  I do not have treatment groups,
therefore do not think I can use GLIMMIX or GLM.  Does anyone have any
suggestions?
Thanks.

Some example data and the expected output would be helpful.

As much as I understand your problem some data step logic or PROC SQL
could be used.