# Conditional regression for 2 SD below / above the mean

I want to interpret an interaction. Usually a conditional regression analysis is done with 1 SD below/above the mean (see Aiken & West, 1993, p. 18). My result is a contrast with $p=.068$ if I take 1.5 SDs $p=.044$. with 2 SDs $p=.033$.

It seems that contrasts get stronger by increasing values the number of SDs. Thus, is it appropriate to report contrasts for 2 SDs in a paper? Why does it have to be 1 SDs?

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I think this post reveals that you are a bit too focused on the p-values involved in your interaction. I recommend focusing more on the values of your focal regression coefficient (and the coefficient's interpretation) at the levels you choose (e.g., plus or minus 1 SD) of the other. There are many reasons why focusing too narrowly on p-values can be misleading, especially when it comes to the interpretations of simple effects. –  Patrick S. Forscher Sep 19 '12 at 2:19