Evidence map›Paper›PMID 31916028›Full record

ArticleThe European journal of health economics : HEPAC : health economics in prevention and care2020

Incorporating self-reported health measures in risk equalization through constrained regression.

A A Withagen-Koster, R C van Kleef, F Eijkenaar

Abstract read
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Article in The European journal of health economics : HEPAC : health economics in prevention and care, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.

0numbers the graph read from it
0cells of the map it votes in
10citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

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3 · Its place in the literature

Who cites it

10 citing papers in PubMed.

  1. Exploration of using constrained regression in Germany's morbidity-based risk adjustment.The European journal of health economics : HEPAC : health economics in prevention and care · 2026
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  2. A critical review of the use of RThe European journal of health economics : HEPAC : health economics in prevention and care · 2025
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors.

A A Withagen-KosterErasmus School of Health Policy & Management, Erasmus University Rotterdam, Rotterdam, The Netherlands. koster@eshpm.eur.nl.
R C van KleefErasmus School of Health Policy & Management, Erasmus University Rotterdam, Rotterdam, The Netherlands.
F EijkenaarErasmus School of Health Policy & Management, Erasmus University Rotterdam, Rotterdam, The Netherlands.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Most health insurance markets with premium-rate restrictions include a risk equalization system to compensate insurers for predictable variation in spending. Recent research has shown, however, that even the most sophisticated risk equalization systems tend to undercompensate (overcompensate) groups of people with poor (good) self-reported health, confronting insurers with incentives for risk selection. Self-reported health measures are generally considered infeasible for use as an explicit 'risk adjuster' in risk equalization models. This study examines an alternative way to exploit this information, namely through 'constrained regression' (CR). To do so, we use administrative data (N = 17 m) and health survey information (N = 380 k) from the Netherlands. We estimate five CR models and compare these models with the actual Dutch risk equalization model of 2016 which was estimated by ordinary least squares (OLS). In the CR models, the estimated coefficients are restricted, such that the under-/overcompensation for groups based on self-reported general health is reduced by 20, 40, 60, 80, or 100%. Our results show that CR can improve outcomes for groups that are not explicitly flagged by risk adjuster variables, but worsens outcomes for groups that are explicitly flagged by risk adjuster variables. Using a new standardized metric that summarizes under-/overcompensation for both types of groups, we find that the lighter constraints can lead to better outcomes than OLS.

Indexed as

Health StatusModels, StatisticalAge FactorsFemaleHumansInsurance CarriersInsurance, HealthMaleModels, EconometricNetherlandsRisk AdjustmentRisk FactorsSelf ReportSex FactorsSocioeconomic FactorsConstrained regressionHealth insuranceRisk equalizationRisk selectionSurvey data

Identifiers

PMID31916028
PMCPMC7214515

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.