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Note. Evaluating exclusionary interventions.

B Dowd¹, R Feldman

¹Division of Health Services Research and Policy, School of Public Health, University of Minnesota, Minneapolis 55455.

Journal of Health Economics

|September 6, 1991

Summary

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When evaluating interventions like Preferred Provider Organizations (PPOs), a control group unaffected by the treatment is essential. This ensures accurate estimation of outcomes in the absence of the intervention.

Area of Science:

Health Services Research
Evaluation Methodology

Background:

Some interventions impact both participants and non-participants.
Preferred Provider Organizations (PPOs) illustrate this, redirecting patients to preferred providers.

Purpose of the Study:

To address the challenge of selecting appropriate control groups in evaluation research.
To identify methods for estimating outcomes in the absence of an intervention when all subjects are affected.

Main Methods:

Discusses the limitations of using an excluded group as a control when the intervention affects all subjects.
Highlights the necessity of a completely unaffected group for accurate control estimations.

Main Results:

Interventions affecting all subjects preclude the use of an excluded group as a valid control.

Related Experiment Videos

Accurate estimation requires comparison with subjects entirely independent of the intervention's influence.

Conclusions:

Standard control groups are inadequate when interventions have widespread effects.
Evaluation research must identify and utilize truly unaffected populations for valid counterfactual estimations.