title: Spatial variation of salt intake in Britain and association with socioeconomic status.
abstract: OBJECTIVE
  To evaluate spatial effects of variation and social determinants of salt intake in Britain.
  
  
  METHODS
  Cross-sectional survey.
  
  
  METHODS
  Great Britain.
  
  
  METHODS
  2105 white male and female participants, aged 19-64 years, from the British National Diet and Nutrition Survey 2000-2001.
  
  
  METHODS
  Participants' sodium intake measured both with a 7-day dietary record and a 24-h urine collection. By accounting for important linear and non-linear risk factors and spatial effects, the geographical difference and spatial patterns of both dietary sodium intake and 24-h urinary sodium were investigated using Bayesian geo-additive models via Markov Chain Monte Carlo simulations.
  
  
  RESULTS
  A significant north-south pattern of sodium intake was found from posterior probability maps after controlling for important sociodemographic factors. Participants living in Scotland had a significantly higher dietary sodium intake and 24-h urinary sodium levels. Significantly higher sodium intake was also found in people with the lowest educational attainment (dietary sodium: coeff. 0.157 (90% credible intervals 0.003, 0.319), urinary sodium: 0.149 (0.024, 0.281)) and in manual occupations (urinary sodium: 0.083 (0.004, 0.160)). These coefficients indicate approximately a 5%, 9% and 4% difference in average sodium intake between socioeconomic groups.
  
  
  CONCLUSIONS
  People living in Scotland had higher salt intake than those in England and Wales. Measures of low socioeconomic position were associated with higher levels of sodium intake, after allowing for geographic location.
authors.affiliation: Division of Mental Health & Wellbeing, Warwick Medical School, University of Warwick, WHO Collaborating Centre for Nutrition, Coventry,  UK.
authors.forename: Chen
authors.initials: C
authors.lastname: Ji
authors.forename: Ngianga-Bakwin
authors.initials: NB
authors.lastname: Kandala
authors.forename: Francesco P
authors.initials: FP
authors.lastname: Cappuccio