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Yukyung Shin 1 Article
Increase in Potential Low-value Magnetic Resonance Imaging Utilization Due to Out-of-pocket Payment Reduction Across Income Groups in Korea: An Experimental Vignette Study
Yukyung Shin, Ji-su Lee, Young Kyung Do
J Prev Med Public Health. 2022;55(4):389-397.   Published online July 11, 2022
DOI: https://doi.org/10.3961/jpmph.22.208
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AbstractAbstract AbstractSummary PDFSupplementary Material
Objectives
This study examined the effect of out-of-pocket (OOP) payment reduction on the potential utilization of low-value magnetic resonance imaging (MRI) across income groups.
Methods
We conducted an experimental vignette survey using a proportional quota-based sample of individuals in Korea (n=1229). In two hypothetical vignettes, participants were asked whether they would be willing to use MRI if they had uncomplicated headache and non-specific low back pain, each before and after OOP payment reduction. To account for the possible role of physician inducement, half of the participants were initially presented with vignettes that included a physician recommendation for low-value care. The predicted probability, slope index of inequality (SII), and relative index of inequality (RII) were calculated using logistic regression.
Results
Before OOP payment reduction, the lowest income quintile was least likely to use low-value MRI regardless of physician inducement (36.7-49.6% for low back pain; 30.5-39.3% for headache). After OOP payment reduction, almost all individuals in each income quintile were willing to use low-value MRI (89.8-98.0% for low back pain; 78.1-90.3% for headache). Absolute and relative inequalities concerning potential low-value MRI utilization decreased after OOP payments were reduced, even without physician inducement (SII: from 8.15 to 5.37%, RII: from 1.20 to 1.06 for low back pain; SII: from 6.99 to 0.83%, RII: from 1.20 to 1.01 for headache).
Conclusions
OOP payment reduction for MRI has the potential to increase low-value care utilization among all income groups while decreasing inequality in low-value care utilization.
Summary
Korean summary
실험적 비네트 디자인을 활용하여 환자 본인부담금 감소가 잠재적 저가치 MRI 이용에 미치는 영향을 소득 수준별로 분석한 연구이다. 본인부담금 감소로 인해 잠재적 저가치 MRI 이용은 모든 소득 수준에서 증가하고 잠재적 저가치 MRI 이용의 소득 수준에 따른 차이는 감소하는 결과를 보였다.

JPMPH : Journal of Preventive Medicine and Public Health