Analysing Paired Data with Covariates

Thanks in advance for your help.

I'm trying to compare means of a continuous variable for paired groups (before and after) while controlling for a continuous covariate. What is the correct way to do this statistically? Does an ANCOVA (or univariate GLM in SPSS) work for paired groups? Thanks for your help,

nevermind, i need to use repeated measures ANCOVA for paired analysis. My biggest problem was that I had a time-varying covariate which had to be dealt with.
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