Adam, I haven't done one of these in quite a while (long enough ago that the counting process syntax wasn't available), so I'll venture a guess. It appears that what you are interested in is the 'initiation' of heart failure (in stochastic processes, heart failure would be an "absorbing event" -- once you have heart failure, you can never again 'not' have it). To me, that is the only way that having a single event makes sense. In that case, covariates after the onset of heart failure do not contribute to your understanding of the incidence and should be discarded. Then the event would be associated with the interval in which it occurred as well as the last interval. This would also make the data consistent with what your local statistician said. Doc Muhlbaier Duke
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