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I'm running a linear mixed effects model with group, time, and the interaction between group and time as fixed effects and a random effect for each subject. The outcome was measured at 3 time points. I was just wondering if it would be more appropriate to include the baseline scores in the model as a covariate with the time 2 and 3 scores as the outcome, or include time 1, 2 and 3 scores as the outcome instead.

Thanks

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