Temporary state - actually it is an event

Hi, experts:

How to implement a temporary state (eg. stroke) in treeage involves a one-time cost or temporary change in quality of life, as shown below?






  • In a Markov model within TreeAge Pro, Stroke would represent an event in a transition subtree, not a health state.

    So your model would have three health states - Well, Post-Stroke and Dead. The Stroke event would be in the transition subtree from the Well state long the pathway to the Post-Stroke state.

    This is very typical in Markov models.


    Hi, Andrew


    Or can we understand the problem in this way? The cost and utility of the temporary state (eg.stroke) can be regarded as the initial cost and initial utility of the post stroke state?


    The stroke itself has certain morbidity and costs associated with the event: hospitalization, follow-up,recovery, etc. We cannot ignore these disutilities and costs in the utility and cost calculations.


    Thanks for your time and patience.


    Best regards




  • The key to understanding this issue is that stroke is not really a state or even a temp state. It is an event. It either happens or it doesn't happen, but no one stays in a stroke state for any reasonable period of time.

    Since stroke is an event in a TreeAge Pro transition subtree, the cost and/or utility would be entered at that event as a "Transition Reward". This would be accumulated only for people/cohort who pass through that event node, not for everyone that starts the cycle in that state.

  • Hi, Andrew


    Thank you, I understand. So is the following structure correct?


  • Yes, that looks good. The cost and utility will only be accrued by those who pass through that event. Examine the Markov Cohort reports and expand the events fully to see how those values are accumulated.

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