Insurance coverage expansion and inequalities in unmet oral healthcare needs in Korea: Repeated cross-sectional analysis, 2007-2015

Prevalence of dental visits in older Japanese adults receiving public assistance

OBJECTIVES

Exemption from paying dental care costs among recipients of public assistance contributes to universal health care coverage. Although this system might reduce the financial barriers to dental care among patients, there are still several other barriers for public assistance recipients. Therefore, this study examined whether receiving public assistance was associated with a higher prevalence of dental visits for any reason, treatment and prevention.

METHODS

Data were obtained from 16 366 respondents from the 2019 wave of a nationwide cohort study on older adults in Japan. Poisson regression analyses with robust error variance were used to examine the associations between receiving public assistance and dental visits, adjusting for number of teeth, dental pain, periodontal conditions, age, sex, number of family members, education, equivalent household income, working status, instrumental activities of daily living, medical conditions, depressive symptoms, instrumental support and geographical variations.

RESULTS

More than half of the non-recipients of public assistance visited a dentist for some reason in the past 6 months. Meanwhile, only 37% of the recipients visited a dentist. In addition, almost half of the non-recipients had treatment visits, while only 34% of the recipients visited. Furthermore, 46% of the non-recipients had dental visits for prevention, while 32% of the recipients had preventive visits. In the fully adjusted models, compared to non-recipients, public assistance recipients were 24% (Prevalence Ratio [PR]: 0.76, 95% Confidence Intervals [CI]: 0.64, 0.90), 23% (PR: 0.77, 95% CI: 0.65, 0.92) and 21% (PR: 0.79, 95% CI: 0.65, 0.95) less likely to have dental visits for any reason, treatment, and prevention, respectively.

CONCLUSIONS

Although recipients were exempted from dental treatment fees, receiving public assistance was associated with a lower prevalence of dental visits for any reason, treatment and prevention. Future studies should identify the barriers to accessing dental care among public assistance recipients to improve dental visits.

Inequalities in unmet health care needs under universal health insurance coverage in China

BACKGROUND

Expanding health insurance is a critical step towards universal health coverage due to its positive effect on reducing unmet health care needs and enhancing equitable access to health care. Despite previous studies on the socioeconomic factors associated with unmet health care needs, few studies have analysed the inequalities in such needs and the impact of universal health insurance coverage on addressing them. This study aimed to measure the contribution of social health insurance (SHI) coverage to inequalities in financially and non-financially constrained unmet health care needs among middle-aged and elderly Chinese adults.

METHODS

The study data were obtained from the China Health and Retirement Longitudinal Study (2011-2015). A total of 11,592 respondents reporting outpatient care needs and 6320 reporting inpatient care needs were included. The concentration index (CI) was employed to measure the extent of income-related inequalities in unmet health care needs. A decomposition method based on a probit model was used to investigate the contribution of SHI to the inequalities.

RESULTS

The incidence rates of unmet outpatient needs due to financial and non-financial constraints were 4.68% and 24.78%, respectively; these rates were 18.69% and 15.73% for unmet inpatient needs. The CIs of unmet outpatient needs due to financial and non-financial constraints were - 0.1872 and 0.0195, respectively; these values were - 0.1558 and 0.0352 for unmet inpatient needs. The percentages of the contribution of SHI to the CIs of financially constrained unmet outpatient and inpatient needs were 0.2639% and 1.8898%, respectively. Moreover, the percentages of the contribution of SHI to the CIs of non-financially constrained unmet outpatient and inpatient needs were - 0.4513% and - 6.4192%, respectively.

CONCLUSION

The universal coverage of SHI in China increased pro-poor inequalities in financially constrained unmet health care needs but decreased pro-rich inequalities in non-financially constrained unmet needs. Additionally, the contribution of SHI to inequalities in financially constrained unmet needs for inpatient care was stronger than that for outpatient care. Policy-makers are advised to introduce favourable reimbursement policies for patients with poor socioeconomic conditions and address both financial and non-financial barriers to promote equitable access to health care for the entire population.

Is there a sexual difference in the relationship between sociodemographic information and the unmet dental care needs of disabled adults? An analysis from a national survey on persons with disabilities

BACKGROUND

Health status and health care utilization in people with disabilities are more likely to be poorer than those without disabilities. Previous studies showed that there were gaps in health-related conditions by sociodemographic information and gender but the association between these factors was not explained. This study aims to analyze the relationship between sociodemographic information and the unmet dental care needs of people with disabilities and explore the effect of sex within this relationship.

METHODS

The 2014 national survey on persons with disabilities was used, which separated unmet healthcare needs into medical and dental services. Unweighted samples included 6,824 people with disabilities in total and 6,555 (96.1% of the total, weighted as 6,583) people aged 20 years or older were selected as the study population. Frequency and chi-square tests were conducted to determine differences in the prevalence of unmet dental needs based on socioeconomic information, chronic diseases, and behavioral factors after applying weights. Logistic regressions were performed using an adjusted model with sociodemographic information, chronic diseases, and behavioral variables. All analyses were performed using IBM SPSS Statistics for Windows, version 26 (IBM Corp., Armonk, N.Y., USA).

RESULTS

Analysis of the sociodemographic factors related to unmet dental care revealed that they were higher in women and the elderly. In the fully adjusted logistic model, most of the sociodemographic information was significantly associated with unmet dental needs. The lowest group was 4.18 times more likely to have unmet dental care needs than the richest group, and females and middle-school graduates were almost twice as likely to experience unmet dental care needs than males and university graduates. Considering the interaction effect of age on unmet dental needs depending on sex differences, the odds ratio decreased for females with every annual increase in both models. Compared with the younger group, the older group showed a lower risk of having unmet dental needs, especially in females.

CONCLUSIONS

The factor most closely related to the unmet dental care needs of disabled people was socioeconomic problems. Its influence also differed by sex and age. Therefore, economic support measures and sexual differences are needed for long-term policy consideration to reduce the unmet dental care needs of disabled people.

Association between long working hours and unmet dental needs in wage workers

BACKGROUND

Many previous studies on the reasons behind unmet dental needs focus on economic issues. However, in this research, we aimed to investigate the relationship between long working hours and unmet dental needs while considering the influence of occupational factors in wage workers.

METHODS

This study used data from the Korea National Health and Nutrition Examination Survey (2012-2018) and analyzed a sample of 12,104 wage workers. Unmet dental needs were defined as cases in which individuals did not receive dental care, despite their need for examination or treatment, within the last year. Long working hours were defined as exceeding 52 h per week, based on the standard working hours stipulated by the Labor Standards Act. A binomial model was applied to calculate the prevalence ratio through multivariate logistic regression analysis.

RESULTS

The prevalence of unmet dental needs was observed in 3,948 cases (32.5%), among which 1,478 attributed their presence to lack of time. The prevalence of unmet dental needs showed an inverse relationship with the education level and household income. The wage workers who worked long hours had the highest prevalence of unmet dental needs. Long working hours were found to be 1.18 times (95% CI 1.07-1.29) more likely to result in unmet dental care compared to working less than 40 h. The relationship between long working hours and unmet dental needs were statistically significant only in men (PR 1.24, 95% CI 1.07-1.43). However, the relationship between long working hours and unmet dental needs owing to time were in both men and women (men: PR 1.59, 95% CI 1.20-2.11, women: PR 1.90, 95% CI 1.48-2.43).

CONCLUSIONS

This study confirmed that long working hours and unmet dental needs are related when occupational factors are taken into consideration, despite the absence of oral health indicators. Using this study as a reference, further research is necessary to identify the underlying causes of unmet dental care and to improve access to dental services in the future.

Reconsidering economic interventions to reduce oral health inequalities

Despite the general recognition of economic factors as fundamental upstream social determinants of health inequalities, interventions to improve health and reduce inequalities tend to focus on proximal health determinants. However, recent socioeconomic crises have increased the focus on economic factors. Health-related approaches to address economic factors can be divided into two categories: (1) indirect approaches, such as financial support for obtaining dental care and fiscal policies targeting unhealthy commodities and (2) direct approaches, such as cash transfers or provision of a universal basic income. For indirect approaches, policies reducing out-of-pocket payments for dental care appear to improve access to services and reduce oral health inequalities. Price policies targeting tobacco and sugar through taxation are associated with declines in periodontal disease and caries, and sugar taxation appears to reduce oral health inequalities. As regards direct approaches, studies on cash transfers to low-income individuals have found no positive impact on dental visits, while results in relation to caries prevention were inconclusive. No dental studies examined the effect of a population approach to income security, such as basic income. Research on economic interventions for oral health inequalities is scarce, and studies using causal inference methods and natural experiments are urgently needed.

Analysis of an Association between Preterm Birth and Parental Educational Level in Japan Using National Data

Preterm birth rate depending on parental educational level in recent years has not been surveyed in Japan. In this study, we showed the trend in preterm birth rate depending on parental educational level from 2000 to 2020 by linking data from the Census regarding individuals' educational level and parents in birth data of the vital statistics. Four types of parental educational level, namely junior high school, high school, technical school or junior college, and university or graduate school, were compared. Slope and relative indexes of inequality for preterm birth by educational level were computed by binomial models. Data on 3,148,711 births and 381,129,294 people were used in the analysis, and data on 782,536 singleton births were used after data linkage. The preterm birth rate (%) for junior high school graduate mothers and fathers was 5.09 and 5.20 in 2020, respectively. Contrarily, the preterm birth rate (%) for parents who graduated from a university or graduate school was 4.24 for mothers and 4.39 for fathers, and the rate tended to increase as educational level decreased, irrespective of parental gender. Results of inequality indexes showed that a statistically significant inequality by parental educational level persisted from 2000 to 2020.

Did Dental Insurance Expansion Improve Dental Care Needs Among Korean Adults? Difference in Difference Analysis

BACKGROUND

In 2012, the Korean government expanded dental insurance for the elderly to promote improved access to dental care. We examined the causal effect of this policy on dental care needs, focusing on low-income older adults.

METHODS

We compared data before and after policy implementation using double difference (DD) and triple difference (DDD) analyses. We used the nationally representative data from the Korea National Health and Nutrition Examination Survey from 2010 and 2016-2018. Individuals aged ≥65 years were included in the treatment group, and individuals aged <65 years were included in the control group.

RESULTS

Dental insurance expansion was associated with a paradoxical increase in perceived unmet dental needs among elderly individuals (8.8 percentage points increase, 95% CI: 4.7 to 13.0). However, there were improvements in dental prosthetics outcomes (denture wearing [4.0 percentage points, 95% CI: 0.2 to 7.9] and dental implants [5.0 percentage points, 95% CI: 2.1 to 7.9]; P < 0.01). Upon analyzing low-income elderly individuals using DDD analysis, we found that the insurance expansion led to a 21.6% smaller increase in unmet dental needs among low-income adults, compared to high-income adults (95% CI, -35.0 to -8.5; P < 0.01).

CONCLUSION

Dental insurance expansion in South Korea resulted in improvements in access to dental prosthetic services overall. It also led to a smaller increase in unmet dental needs among low-income older adults, compared to high-income adults.

Assessing inequities in unmet oral care needs among adults in Sweden: An intersectional approach

OBJECTIVES

The goal of the Swedish oral healthcare system is to achieve good oral health and equitable access to care for the entire population. However, considerable inequities in oral health and care are evident and occur across a range of social dimensions. This study uses an intersectional approach to examine complex inequities in unmet oral care needs among adults in Sweden over the period 2004-2021.

METHODS

Data were obtained from 14 Health on Equal Terms surveys conducted during 2004-2021. The final sample was 129 473 individuals aged 26-84 years. Applying intersectional analysis of individual heterogeneity and discriminatory accuracy, inequities in unmet oral care needs were estimated across 48 intersectional strata defined by gender, age, educational level, individual disposable income and immigrant status.

RESULTS

A high risk of unmet oral care needs was found among strata consisting of immigrants and those with low income. However, being an immigrant and/or having a low income did not universally entail a high risk but varied by the social position along other axes, particularly age and education. The discriminatory accuracy was moderate.

CONCLUSION

Groups with certain social disadvantages are highly heterogeneous themselves. An intersectionality approach is important to prevent the risk of stigmatizing large heterogenous groups while failing to identify the most vulnerable strata. The discriminatory accuracy analysis suggested that further policy and/or interventions may be the most effective if approaching the whole population, combined with selected targeted interventions directed at the most disadvantaged social strata.

Did expansion of insurance coverage for major diseases in Korea induce a positive spillover effect on dental service utilization?

Although people with serious major diseases are disproportionately likely to have poor oral health, they are also more likely to defer treatment for oral health conditions due to financial constraints. The South Korean government introduced a comprehensive benefit expansion policy covering four major disease categories in 2013: cancer, cardiac diseases, cerebrovascular diseases, and rare diseases. Meanwhile, a policy expanding benefits for dental prosthetic services for the elderly was also introduced during the same period. Using nationally representative Korean Health Panel data from 2012 to 2017, we performed a difference-in-difference (DID) analysis to examine the positive spillover effect of insurance expansion for the four major disease categories on encouraging dental service utilization (frequency of dental visits and dental out-of-pocket payments) or decreasing unmet dental needs. Additionally, a triple-difference (TD) analysis was performed to examine whether the effect of coverage expansion of dental prosthetic services on dental service utilization was larger among the beneficiaries of the expansion for the four major disease categories. Benefit expansion for the four major disease categories did not significantly affect dental service utilization among the beneficiaries (DID model) during all study years and slightly increased unmet dental needs in 2014 and 2015. However, the effect of expanded coverage for dental prosthetic services on encouraging dental service utilization was larger (TD model) among the beneficiaries of the policy for the four major disease categories than among non-beneficiaries when we defined the beneficiaries as individuals with two or more household members who had one of the four major diseases. Our results suggest a need to provide more intense coverage for those with comorbidities by embracing the concept of proportionate universalism in the coverage of dental services.

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

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.

Impact of Long Working Hours and Shift Work on Perceived Unmet Dental Need: A Panel Study

This study investigates whether workers with long working hours as well as shift workers perceive higher unmet dental care needs, and whether there is a gender difference in the associations. We used the Korea Health Panel (2009, 2011–2014) involving 20,451 person-wave observations from 5567 individuals. Perceived unmet dental care needs was defined when the participants reported that they perceived a need for dental treatment or check-up but had failed to receive dental care services during the past year. Fixed effects logit models were applied to examine how changes in weekly working hours or shift work status were linked to changes in perceived unmet dental needs within each individual. Among participants, 15.9–24.7% reported perceived unmet dental needs and the most common reason was time scarcity. We found that long working hours (>52 h/week) was significantly associated with perceived unmet dental needs due to time scarcity in both men (OR = 1.42, 95% CI 1.13–1.78) and women (OR = 1.35, 95% CI 1.03–1.79) compared workers working 40–52 h per week. Shift work was also a significant risk factor, but only in women (OR = 1.57, 95% CI 1.06–2.32). These findings provide evidence for labor policies to reduce working hours in order to improve access to dental care services.