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Did Expanded Dental Insurance Improve Chewing Ability in the Older Korean Population? Results of an Interrupted Time-series Analysis

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Title: Did Expanded Dental Insurance Improve Chewing Ability in the Older Korean Population? Results of an Interrupted Time-series Analysis
Authors: Nam-Hee Kim, Jarvis T. Chen, Ichiro Kawachi
Source: Journal of Epidemiology, Vol 32, Iss 5, Pp 215-220 (2022)
Publisher Information: Japan Epidemiological Association, 2022.
Publication Year: 2022
Collection: LCC:Medicine (General)
Subject Terms: dental insurance, chewing ability, interrupted time-series analysis, quasi-experimental, older adults, causal inference, Medicine (General), R5-920
More Details: Background: In 2012, the Korean National Health Insurance extended its coverage to include denture services for older adults. We examined whether the new policy resulted in improved chewing ability in the eligible population. Methods: We used interrupted time-series (ITS) analysis, a quasi-experimental design, to analyze the effect of the policy. We used data from the Korea National Health and Nutrition Examination Survey conducted from 2007 to 2016–2018. The study population consisted of two groups: the treatment group, aged 65 years or older and eligible for the dental insurance benefit; and the control group, those younger than 65 years and ineligible. The main evaluated outcome was self-reported chewing difficulty. Results: The ITS analysis showed that chewing difficulty decreased annually by 0.93% (95% CI, −1.30 to −0.55%) and 0.38% (95% CI, −0.59 to −0.16%) after the policy extension in the older than 65 and younger than 65 groups, respectively. However, we could not conclude that the insurance extension affected chewing difficulty because there was a decrease in the control group as well. Conclusion: Chewing ability improved in both older and younger adults regardless of dental insurance coverage for older adults. Other exogenous factors probably led to the improvements in chewing ability as well as dental insurance benefits.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 0917-5040
1349-9092
Relation: https://www.jstage.jst.go.jp/article/jea/32/5/32_JE20200417/_pdf; https://doaj.org/toc/0917-5040; https://doaj.org/toc/1349-9092
DOI: 10.2188/jea.JE20200417
Access URL: https://doaj.org/article/54d6d357d06440ada9f20a916553ff1d
Accession Number: edsdoj.54d6d357d06440ada9f20a916553ff1d
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  Data: Did Expanded Dental Insurance Improve Chewing Ability in the Older Korean Population? Results of an Interrupted Time-series Analysis
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  Data: Journal of Epidemiology, Vol 32, Iss 5, Pp 215-220 (2022)
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  Data: Japan Epidemiological Association, 2022.
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  Data: 2022
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  Data: <searchLink fieldCode="DE" term="%22dental+insurance%22">dental insurance</searchLink><br /><searchLink fieldCode="DE" term="%22chewing+ability%22">chewing ability</searchLink><br /><searchLink fieldCode="DE" term="%22interrupted+time-series+analysis%22">interrupted time-series analysis</searchLink><br /><searchLink fieldCode="DE" term="%22quasi-experimental%22">quasi-experimental</searchLink><br /><searchLink fieldCode="DE" term="%22older+adults%22">older adults</searchLink><br /><searchLink fieldCode="DE" term="%22causal+inference%22">causal inference</searchLink><br /><searchLink fieldCode="DE" term="%22Medicine+%28General%29%22">Medicine (General)</searchLink><br /><searchLink fieldCode="DE" term="%22R5-920%22">R5-920</searchLink>
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  Data: Background: In 2012, the Korean National Health Insurance extended its coverage to include denture services for older adults. We examined whether the new policy resulted in improved chewing ability in the eligible population. Methods: We used interrupted time-series (ITS) analysis, a quasi-experimental design, to analyze the effect of the policy. We used data from the Korea National Health and Nutrition Examination Survey conducted from 2007 to 2016–2018. The study population consisted of two groups: the treatment group, aged 65 years or older and eligible for the dental insurance benefit; and the control group, those younger than 65 years and ineligible. The main evaluated outcome was self-reported chewing difficulty. Results: The ITS analysis showed that chewing difficulty decreased annually by 0.93% (95% CI, −1.30 to −0.55%) and 0.38% (95% CI, −0.59 to −0.16%) after the policy extension in the older than 65 and younger than 65 groups, respectively. However, we could not conclude that the insurance extension affected chewing difficulty because there was a decrease in the control group as well. Conclusion: Chewing ability improved in both older and younger adults regardless of dental insurance coverage for older adults. Other exogenous factors probably led to the improvements in chewing ability as well as dental insurance benefits.
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      – SubjectFull: chewing ability
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