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Special ArticleOpen Access
Handling Time in Economic Evaluation Studies
Permsuwan U 
,
Guntawongwan K ,
Buddhawongsa P
,
Guntawongwan K ,
Buddhawongsa P Background: Time horizon and discounting are important issues in economic evaluation studies and have an
impact on the priority of different programs.
Objective: Provides supporting rational and theories to propose the appropriate discount rate for both cost
and effect and time horizon for conducting economic evaluation studies in Thailand.
Material and Method: Describe the theories that explain time horizon for both the cost of a study and its effect.
Conclusion: The recommended uniform discount rate for both costs and effects at the base case is 3% with a
variance in range from 0-6% by sensitivity analysis. The time horizon should be long enough to capture the
full costs and effects of the programs.
Keywords: Time horizon, Discounting, Economic evaluation guideline, Thailand
impact on the priority of different programs.
Objective: Provides supporting rational and theories to propose the appropriate discount rate for both cost
and effect and time horizon for conducting economic evaluation studies in Thailand.
Material and Method: Describe the theories that explain time horizon for both the cost of a study and its effect.
Conclusion: The recommended uniform discount rate for both costs and effects at the base case is 3% with a
variance in range from 0-6% by sensitivity analysis. The time horizon should be long enough to capture the
full costs and effects of the programs.
Keywords: Time horizon, Discounting, Economic evaluation guideline, Thailand
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