Hello! I'm calculating the relative excess risk due to interaction (RERI) using Cox's proportional hazards model by using the formula according to Li et al.: RERI(HR) = HR(1,1) - HR(1,0) - HR(0,1) + 1. This generates a number indicating whether or not there is an additive interaction. My question is how can I retrieve a P-value and a 95 % confidence interval for this excess risk using the SAS software? Thank you very much for your help! SokolowLyon
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