How to Interpret the following result of RERI from epiR Package. I know this coefficient (est) is Measure of effect modification on additive scale. Butits value is negative. why this is so? I understood that as it is lower than zero so effect is not synergistic. Am i right) I got RERI coefficient as -0-029 with confidence intervals (-0.51-0.45). How to interpret it.

> epi.interaction(model = coxphModel, param = "product", coef = c(2,3,4), type = "RERI", conf.level = 0.95) est lower upper 1 -0.02905938 -0.5144146 0.4562958

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