Paired samples t test across more than 2 within person measurements

[xxartpopxx]

How would I code this in SAS?

I have a mean at baseline (score_0) 3 months (score_3) 6 months (score_6)  9 months (score_9) and 12 months (score_12) 

would I run a proc anova?

[ballardw]

What is the research question you are trying to answer?

Please be a bit more detailed that "analyze data".

[SteveDenham]

If these are truly 'paired', i.e., you have a measurement on subjects at the 5 timepoints presented, then you ought to consider doing a repeated measures ANOVA.  See example https://documentation.sas.com/?cdcId=pgmsascdc&cdcVersion=9.4_3.4&docsetId=statug&docsetTarget=statu... .

if your data do not have normally distributed independent errors, you may need to try something like this. 

SteveDenham