When evaluating the effect of a continuous covariate that changes from one wave to the next, (in this instance, the relationship between a continuous health index score and mortality risk) do I need to indicate that the covariate varies with time via the stcox, tvc(option), or does Stata automatically do this? While previous posts touch on this, I have seen contradictory answers. Example below for clarification.
Sample Cox regressions:
#1: stcox female age index_score
#2: stcox female age, tvc(index_score)
The first regression shows a much stronger effect of a one unit change in the index score on mortality risk than the second.
Thank you
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