title: Socio-economic status of patients registered with NHS dental services in Scotland: an inverse 'dental' care law?
abstract: OBJECTIVE
  To compare the socioeconomic characteristics of the population registered with an NHS dentist, split by the NHS General Dental Services (GDS) and Salaried General Dental Services (SGDS) across Scotland.
  
  
  METHODS
  Routine data on NHS dental registrations were obtained from the Information Services Division of NHS Scotland. Registrations by residential postcode ranked by Scottish Index of Multiple Deprivation (SIMD) quintiles were calculated separately for adults and children for both GDS and SGDS. Spearman's rank correlation coefficient and the relative index of inequality (RII) were calculated.
  
  
  RESULTS
  In September 2010, 69% (3,581,663) of the Scottish population was registered with an NHS dentist. The GDS had 95% of the total registrations and 5% were with the SGDS. There was a linear relationship in the SGDS where dental registrations with the SGDS were higher the more deprived the population of adults (RII = -1.6) and for children (RII = -7.8). In the GDS there was an inverse care relationship for children (RII = 1.4) but the confidence intervals for the adults' RII included zero so was not significant. Total NHS dental registration across Scotland (for both children and adults) did not vary by SIMD quintile.
  
  
  CONCLUSIONS
  Contrary to expectations, no inverse dental care law could be demonstrated for adults receiving NHS dental care in Scotland in the GDS. There was a statistically significant inverse dental care law for children in the GDS. The SGDS has higher registration rates among the most deprived population and acts to reduce inequality in access to dental care, thereby removing any inverse dental care law.
authors.affiliation: NHS Health Scotland, Thistle House, 91 Haymarket Terrace, Edinburgh, EH12 5HE, Scotland. colwyn.jones@nhs.net
authors.forename: C M
authors.initials: CM
authors.lastname: Jones
authors.forename: D
authors.initials: D
authors.lastname: Clouting
authors.forename: G
authors.initials: G
authors.lastname: McCartney
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D003695:Delivery of Health Care / Q000706:statistics & numerical data*; D006297:Health Services Accessibility / Q000706:statistics & numerical data*; D006801:Humans; D008875:Middle Aged; D012189:Retrospective Studies; D012606:Scotland; D012923:Social Class; D012959:Socioeconomic Factors; D013222:State Medicine / Q000191:economics / Q000706:statistics & numerical data*