IDEAS home Printed from https://ideas.repec.org/a/gam/jijerp/v18y2021i6p3003-d517416.html

Did Expanded Dental Insurance Reduce Out-of-Pocket Expenditures on Dental Care among Older Adults in Korea? Interrupted Time-Series Analysis

Author

Listed:
  • Nam-Hee Kim

    (Department of Dental Hygiene, Wonju College of Medicine, Yonsei University, 20 Ilsan-ro, Wonju 26426, Korea
    Department of Social and Behavioral Sciences, Harvard T. H. Chan School of Public Health, 667 Huntington Avenue, Boston, MA 02115, USA)

  • Se-Hwan Jung

    (Department of Preventive and Public Health Dentistry, College of Dentistry, Gangneung-Wonju National University & Research Institute of Oral Science, Gangneung-Wonju National University, Gangneung 25457, Korea)

  • Ichiro Kawachi

    (Department of Social and Behavioral Sciences, Harvard T. H. Chan School of Public Health, 667 Huntington Avenue, Boston, MA 02115, USA)

Abstract

The Korean National Health Insurance extended its coverage to reduce the economic burden of receiving dentures and implants for older adults in 2012 and 2014, respectively. We examined whether the new policy resulted in reduced out-of-pocket dental care expenditure in the eligible population, specifically focusing on low-income adults. We used interrupted time-series analysis (ITSA), a quasi-experimental design, to identify the effects of the policy among persons aged 65 or older. Data were extracted from the Korea Health Panel Survey (KHP; 2008–2017). The main outcome was out-of-pocket expenditures on dental care. The ITSA showed that expenditures decreased annually by 4.5% (RR: 0.96, 95% CI: 0.95–0.96) between 2012 and 2014. However, expenditure increased by 7.8% (RR: 1.08, 95% CI: 1.07–1.08) after 2014. Dental insurance coverage did not contribute to reducing the out-of-pocket expenses for dentures among low-income adults, while coverage of dental implants led to an increase in dental expenditure.

Suggested Citation

  • Nam-Hee Kim & Se-Hwan Jung & Ichiro Kawachi, 2021. "Did Expanded Dental Insurance Reduce Out-of-Pocket Expenditures on Dental Care among Older Adults in Korea? Interrupted Time-Series Analysis," IJERPH, MDPI, vol. 18(6), pages 1-9, March.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:6:p:3003-:d:517416
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1660-4601/18/6/3003/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/1660-4601/18/6/3003/
    Download Restriction: no
    ---><---

    References listed on IDEAS

    as
    1. Roshni Mangalore, 2006. "Income, health and health care utilization in the UK," Applied Economics, Taylor & Francis Journals, vol. 38(6), pages 605-617.
    2. Mohd Masood & Aubrey Sheiham & Eduardo Bernabé, 2015. "Household Expenditure for Dental Care in Low and Middle Income Countries," PLOS ONE, Public Library of Science, vol. 10(4), pages 1-11, April.
    3. Amal Malehi & Fatemeh Pourmotahari & Kambiz Angali, 2015. "Statistical models for the analysis of skewed healthcare cost data: a simulation study," Health Economics Review, Springer, vol. 5(1), pages 1-16, December.
    4. Jin-Sun Choi & Se-Hwan Jung, 2020. "The Impact of Expanded National Health Insurance Coverage of Dentures and Dental Implants on Dental Care Utilization among Older Adults in South Korea: A Study Based on the Korean Health Panel Survey," IJERPH, MDPI, vol. 17(17), pages 1-11, September.
    5. McCartney, Gerry & Collins, Chik & Mackenzie, Mhairi, 2013. "What (or who) causes health inequalities: Theories, evidence and implications?," Health Policy, Elsevier, vol. 113(3), pages 221-227.
    6. Manski, R.J. & Goodman, H.S. & Reid, B.C. & Macek, M.D., 2004. "Dental Insurance Visits and Expenditures among Older Adults," American Journal of Public Health, American Public Health Association, vol. 94(5), pages 759-764.
    7. Ariel Linden, 2015. "Conducting interrupted time-series analysis for single- and multiple-group comparisons," Stata Journal, StataCorp LLC, vol. 15(2), pages 480-500, June.
    Full references (including those not matched with items on IDEAS)

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Tomoko Kodama & Yusuke Ida & Katsuo Oshima & Hiroko Miura, 2021. "Are Public Oral Care Services Evenly Distributed?—Nation-Wide Assessment of the Provision of Oral Care in Japan Using the National Database of Health Insurance Claims," IJERPH, MDPI, vol. 18(20), pages 1-15, October.

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. KAMKOUM, Arnaud Cedric, 2023. "The Federal Reserve’s Response to the Global Financial Crisis and its Effects: An Interrupted Time-Series Analysis of the Impact of its Quantitative Easing Programs," Thesis Commons d7pvg, Center for Open Science.
    2. Drew M. Anderson & David B. Monaghan & Jed Richardson, 2024. "Can the Promise of Free Education Improve College Attainment? Lessons from the Milwaukee Area Technical College Promise," Research in Higher Education, Springer;Association for Institutional Research, vol. 65(8), pages 1747-1770, December.
    3. A. Mukasheva & N. Saparkhojayev & Z. Akanov & A. Algazieva, 2019. "The Prevalence of Diabetes in the Republic of Kazakhstan Based on Regression Analysis Methods," International Journal of Health and Medical Sciences, Mohammad A. H. Khan, vol. 5(1), pages 8-16.
    4. Vonneilich, Nico & Lüdecke, Daniel & von dem Knesebeck, Olaf, 2020. "Educational inequalities in self-rated health and social relationships – analyses based on the European Social Survey 2002-2016," Social Science & Medicine, Elsevier, vol. 267(C).
    5. Samba Diop & Simplice A. Asongu, 2022. "The impact of Covid-19 and Russia-Ukraine war on food prices in fragile countries: misfortunes never come singly," Working Papers 22/055, European Xtramile Centre of African Studies (EXCAS).
    6. Mariano Barrés-Carsí & Jorge Navarrete-Dualde & Javier Quintana Plaza & Elena Escalona & Christian Muehlendyck & Thibaut Galvain & José Baeza & Antonio Balfagón, 2022. "Healthcare resource use and costs related to surgical infections of tibial fractures in a Spanish cohort," PLOS ONE, Public Library of Science, vol. 17(11), pages 1-12, November.
    7. Díaz, Juan-José & Sánchez, Alan & Diez-Canseco, Francisco & Jaime Miranda, J. & Popkin, Barry M., 2023. "Employment and wage effects of sugar-sweetened beverage taxes and front-of-package warning label regulations on the food and beverage industry: Evidence from Peru," Food Policy, Elsevier, vol. 115(C).
    8. Meenan, Richard T. & Frank, Lawrence D. & Saelens, Brian E. & Young, Deborah R. & Kuntz, Jennifer L. & Dickerson, John F. & Wali, Behram & Keast, Erin M. & Fortmann, Stephen P., 2022. "Effects of an urban light rail line on health care utilization and cost: A pre-post assessment," Transport Policy, Elsevier, vol. 123(C), pages 112-120.
    9. Leonardo Perini & Enrico Bertacchini & Roberto Zanola, 2025. "The Italian Cinema Under the Shadow of Censorship: An empirical investigation of post-fascism period," ACEI Working Paper Series AWP-05-2025, Association for Cultural Economics International.
    10. Justyna Rój & Maciej Jankowiak, 2021. "Socioeconomic Determinants of Health and Their Unequal Distribution in Poland," IJERPH, MDPI, vol. 18(20), pages 1-20, October.
    11. Elvina Merkaj & Raffaella Santolini, 2021. "National Policies In Response To The Covid-19 Pandemic: The Case Of Friuli-Venezia-Giulia And Umbria," Working Papers 456, Universita' Politecnica delle Marche (I), Dipartimento di Scienze Economiche e Sociali.
    12. Bijwaard, Govert, 2021. "Educational Differences in Mortality and Hospitalisation for Cardiovascular Diseases for Males," IZA Discussion Papers 14507, IZA Network @ LISER.
    13. Avni, Shlomit & Filc, Dani & Davidovitch, Nadav, 2015. "The Israeli Medical Association's discourse on health inequity," Social Science & Medicine, Elsevier, vol. 144(C), pages 119-126.
    14. Saisai Wu & Lang Qin & Chen Shen & Xiangyang Zhou & Jianzhai Wu, 2022. "Food Retail Network Spatial Matching and Urban Planning Policy Implications: The Case of Beijing, China," Land, MDPI, vol. 11(5), pages 1-19, May.
    15. Sutherland, Alex & Ariel, Barak & Farrar, William & De Anda, Randy, 2017. "Post-experimental follow-ups—Fade-out versus persistence effects: The Rialto police body-worn camera experiment four years on," Journal of Criminal Justice, Elsevier, vol. 53(C), pages 110-116.
    16. Christopher Ksoll & Kristine Bos & Sarah Hughes & Anthony Harris & Arif Mamun, "undated". "Evaluation Design Report for the Benin Power Compact's Electricity Generation Project and Electricity Distribution Project," Mathematica Policy Research Reports 9f8974513ee745aaac3b5c62e, Mathematica Policy Research.
    17. Niccodemi, Gianmaria & Bijwaard, Govert, 2018. "Education, Intelligence and Diseases in Old Age," IZA Discussion Papers 11605, IZA Network @ LISER.
    18. Hsiang-Te Tsuei, Sian & Chi-Man Yip, Winnie, 2025. "How hospitals’ goal setting, feedback, and process standardization capacity impact provider payment reforms," Social Science & Medicine, Elsevier, vol. 370(C).
    19. Fiorentini, Gianluca & Bruni, Matteo Lippi & Mammi, Irene, 2022. "The same old medicine but cheaper: The impact of patent expiry on physicians’ prescribing behaviour," Journal of Economic Behavior & Organization, Elsevier, vol. 204(C), pages 37-68.
    20. Zhang, Dingxuan & Sun, Yuying & Duan, Hongbo & Hong, Yongmiao & Wang, Shouyang, 2023. "Speculation or currency? Multi-scale analysis of cryptocurrencies—The case of Bitcoin," International Review of Financial Analysis, Elsevier, vol. 88(C).

    More about this item

    Keywords

    ;
    ;
    ;
    ;
    ;
    ;

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jijerp:v:18:y:2021:i:6:p:3003-:d:517416. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.