changing costs and utilities in a markov cancer health state
In a CUA model for cancer screening, how do you model a state that has changing costs and utilities depending on the cycle.
Specifically, once the patient enters a post-cancer state, utilities and costs progressively increase for 5 years, and then remain stable from the 6th year on.
If I simply use _stage, I understand the formula would change according to how many cycles have passed, not specifically according to how many cycles the patient spent in each state.
Is is possible to use tunnels to solve this? Or the tunnel function works only for increasing probabilities?
How do you handle this?