I'm struggling with the following;

I have two dependent variables (A and B) which are continous and highly correlated with each other (Pearson 0.9). I want to find out if A>B, A=B or A<B. The most logical test would be to perform a paired samples T test in SPSS, but I also want to correct for possible confounders (age, sex, etc.). Which test should I use? I'm thinking of a repeated measures MANCOVA, whereby I enter A and B as repeated measures, but I'm not getting output about the relationship between A and B. Does anyone have a suggestion on how to solve this?

Many thanks,

Frank