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A cross-national comparison of income gradients in oral health quality-of-life in four welfare states: application of the Korpi and Palme typology
  1. Anne E Sanders1,
  2. Gary D Slade1,
  3. Mike T John2,
  4. James G Steele3,
  5. A Liisa Suominen-Taipale4,
  6. Satu Lahti5,
  7. Nigel M Nuttall6,
  8. P Finbarr Allen7
  1. 1 University of North Carolina at Chapel Hill, United States;
  2. 2 Department of Diagnostic and Biological Sciences, University of Minnesota, United States;
  3. 3 Department of Restorative Dentistry, School of Dental Sciences, University of Newcastle upon Tyne, United States;
  4. 4 National Institute of Health and Welfare, United Kingdom;
  5. 5 Department of Community Dentistry, Institute of Dentistry, University of Oulu, Finland;
  6. 6 Dental Public Health & Health Psychology, University of Dundee, Dundee Dental Hospital & School, Finland;
  7. 7 Department of Restorative Dentistry, University Dental School & Hospital, Wilton, Cork, United Kingdom
  1. E-mail: anne_sanders{at}dentistry.unc.edu

Abstract

Background: The extent to which different welfare states are associated with different health outcomes, we examined associations of welfare state and oral health quality-of-life in four wealthy countries. We hypothesized that targeting the poor is associated with greater income inequality in oral health quality-of-life than providing earnings-related benefits to all citizens.

Methods: Data were from nationally representative surveys in the United Kingdom (n=4064), Finland (n=5078), Germany (n=1454,) and Australia (n=2292) conducted from 1998–2002. The typology of Korpi and Palme classifies these countries into four welfare states. In each survey, subjects answered 14 questions of the Oral Health Impact Profile (OHIP-14) questionnaire which evaluates the adverse consequence of dental conditions on quality-of-life. For each country, survey estimation commands were used to create linear regression models that estimated the slope of the gradient between four quartiles of income and OHIP-14 severity scores. Parameter estimates for income gradients were contrasted across countries using Wald chi-square tests specifying a critical P-value of 0.008, equivalent to a Bonferroni correction of P<0.05 for the six pairwise tests.

Results: Statistically significant income gradients in OHIP-14 severity scores were found in all countries except Germany. A global test confirmed a significant cross-national difference in the magnitude of income gradients. In Australia, where a flat rate of benefits targeted the poor, the mean OHIP severity score reduced by 1.7 units (95% confidence interval: -2.15, -1.34) with each increasing quartile of household income, a significantly steeper gradient than in other countries.

Conclusion: The coverage and generosity of welfare state benefits appear to influence levels of inequality in population oral health quality-of-life.

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