title: SRH and HrQOL: does social position impact differently on their link with health status?
abstract: BACKGROUND
  Self-rated Health (SRH) and health-related quality of life (HRQoL) are used to evaluate health disparities. Like all subjective measures of health, they are dependent on health expectations that are associated with socioeconomic characteristics. It is thus needed to analyse the influence played by socioeconomic position (SEP) on the relationship between these two indicators and health conditions if we aim to use them to study health disparities. Our objective is to assess the influence of SEP on the relationship between physical health status and subjective health status, measured by SRH and HRQoL using the SF-36 scale.
  
  
  METHODS
  We used data from the French National Health Survey. SEP was assessed by years of education and household annual income. Physical health status was measured by functional limitations and chronic low back pain.
  
  
  RESULTS
  Regardless of their health status, people with lower SEP were more likely than their more socially advantaged counterparts to report poor SRH and poorer HRQoL, using any of the indicators of SEP. The negative impact of chronic low back pain on SRH was relatively greater in people with a high SEP than in those with a low SEP. In contrast, chronic low back pain and functional limitations had less impact on physical and mental component scores of quality of life for socially advantaged men and women.
  
  
  CONCLUSIONS
  Both SRH and HRQoL were lower among those reporting functional limitations or chronic low back pain. However, the change varied according SEP and the measure. In relative term, the negative impact of a given health condition seems to be greater on SRH and lower on HRQoL for people with higher SEP in comparison with people with low SEP. Using SRH could thus decrease socioeconomic differences. In contrast using HRQoL could increase these differences, suggesting being cautious when using these indicators for analyzing health disparities.
authors.affiliation: INSERM-UMR1027, Toulouse, France. cyrildelpierre@yahoo.fr
authors.forename: Cyrille
authors.initials: C
authors.lastname: Delpierre
authors.forename: Michelle
authors.initials: M
authors.lastname: Kelly-Irving
authors.forename: Mette
authors.initials: M
authors.lastname: Munch-Petersen
authors.forename: Valérie
authors.initials: V
authors.lastname: Lauwers-Cances
authors.forename: Geetanjali D
authors.initials: GD
authors.lastname: Datta
authors.forename: Benoît
authors.initials: B
authors.lastname: Lepage
authors.forename: Thierry
authors.initials: T
authors.lastname: Lang
mesh_terms: D005260:Female; D005602:France; D054624:Health Status Disparities; D006306:Health Surveys / Q000295:instrumentation; D006801:Humans; D007407:Interviews as Topic; D008297:Male; D011788:Quality of Life; D057566:Self Report; D012923:Social Class