Dear listers,
I´m investigating the effect of a dichotomous variable on survival.
Looking at the graphs they are parallell after the first 48 hrs, but
there is a difference within the first 48 hrs. Is it reasonable to
present the cox regression analysis with all the patients and then
discard the patients dead within 48 hrs and redo the analysis-(this
gives a significant effect in the first analysis and non-significant
in the latter as suspected from the graphs)? Or is there a more
analytical way to find the exact time from which the two groups no
longer differ?
Regards,
M
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