First time posting here. A great discussion forum!
My question is, how do we report the results of a survival model with non-linear terms? For example, if we fit a model using
cph() for a continuous variable using
rcs(var, df=3), we’ll end up with two coefficients (linear (
var) and non-linear(
var')) in the summary table. Is it acceptable to report the
exp(coef) as HR for both components in a manuscript or do not report HRs for the variable altogether? The following paper reports coefficients with their SEs (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6005015/), but do not report HR values as the variable has both linear and non-linear components. If the variable is not a key exposure variable, there is little chance of considering the plot of the relative hazard ratio using
Predict() in a manuscript. In this case, what is the appropriate method of reporting the results in a table format?
Do we have any good guidance or paper/s to refer to in this regard?