title: Comparing the accuracy of two secondary food environment data sources in the UK across socio-economic and urban/rural divides.
abstract: BACKGROUND
  Interest in the role of food environments in shaping food consumption behaviours has grown in recent years. However, commonly used secondary food environment data sources have not yet been fully evaluated for completeness and systematic biases. This paper assessed the accuracy of UK Points of Interest (POI) data, compared to local council food outlet data for the county of Cambridgeshire.
  
  
  METHODS
  Percentage agreement, positive predictive values (PPVs) and sensitivities were calculated for all food outlets across the study area, by outlet type, and across urban/rural/SES divisions.
  
  
  RESULTS
  Percentage agreement by outlet type (29.7-63.5%) differed significantly to overall percentage agreement (49%), differed significantly in rural areas (43%) compared to urban (52.8%), and by SES quintiles. POI data had an overall PPV of 74.9%, differing significantly for Convenience Stores (57.9%), Specialist Stores (68.3%), and Restaurants (82.6%). POI showed an overall 'moderate' sensitivity, although this varied significantly by outlet type. Whilst sensitivities by urban/rural/SES divides varied significantly from urban and least deprived reference categories, values remained 'moderate'.
  
  
  CONCLUSIONS
  Results suggest POI is a viable alternative to council data, particularly in terms of PPVs, which remain robust across urban/rural and SES divides. Most variation in completeness was by outlet type; lowest levels were for Convenience Stores, which are commonly cited as 'obesogenic'.
authors: UKCRC Centre for Diet and Activity Research, Institute of Public Health, Box 296, Forvie Site, Robinson Way, University of Cambridge, Cambridge CB2 0SR, UK. tb464@medschl.cam.ac.uk
authors: Thomas
authors: T
authors: Burgoine
authors: Flo
authors: F
authors: Harrison
mesh_terms: D003625:Data Collection / Q000592:standards* / Q000706:statistics & numerical data; D005522:Food Services / Q000191:economics* / Q000706:statistics & numerical data; D006801:Humans; D012147:Restaurants / Q000191:economics / Q000706:statistics & numerical data; D012424:Rural Population / Q000706:statistics & numerical data; D012680:Sensitivity and Specificity; D012959:Socioeconomic Factors; D006113:United Kingdom; D014505:Urban Population / Q000706:statistics & numerical data