title: Development and reliability testing of a food store observation form.
abstract: OBJECTIVE
  To develop a reliable food store observational data collection instrument to be used for measuring product availability, pricing, and promotion.
  
  
  METHODS
  Observational data collection.
  
  
  METHODS
  A total of 120 food stores (26 supermarkets, 34 grocery stores, 54 gas/convenience stores, and 6 mass merchandise stores) in the Chicago metropolitan statistical area.
  
  
  METHODS
  Inter-rater reliability for product availability, pricing, and promotion measures on a food store observational data collection instrument.
  
  
  METHODS
  Cohen's kappa coefficient and proportion of overall agreement for dichotomous variables and intra-class correlation coefficient for continuous variables.
  
  
  RESULTS
  Inter-rater reliability, as measured by average kappa coefficient, was 0.84 for food and beverage product availability measures, 0.80 for interior store characteristics, and 0.70 for exterior store characteristics. For continuous measures, average intra-class correlation coefficient was 0.82 for product pricing measures; 0.90 for counts of fresh, frozen, and canned fruit and vegetable options; and 0.85 for counts of advertisements on the store exterior and property.
  
  
  CONCLUSIONS
  The vast majority of measures demonstrated substantial or almost perfect agreement. Although some items may require revision, results suggest that the instrument may be used to reliably measure the food store environment.
authors.affiliation: Institute for Health Research and Policy, University of Illinois at Chicago, Chicago, IL. Electronic address: lrimkus@uic.edu.
authors.forename: Leah
authors.initials: L
authors.lastname: Rimkus
authors.forename: Lisa M
authors.initials: LM
authors.lastname: Powell
authors.forename: Shannon N
authors.initials: SN
authors.lastname: Zenk
authors.forename: Euna
authors.initials: E
authors.lastname: Han
authors.forename: Punam
authors.initials: P
authors.lastname: Ohri-Vachaspati
authors.forename: Oksana
authors.initials: O
authors.lastname: Pugach
authors.forename: Dianne C
authors.initials: DC
authors.lastname: Barker
authors.forename: Elissa A
authors.initials: EA
authors.lastname: Resnick
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Quinn
authors.forename: Jaana
authors.initials: J
authors.lastname: Myllyluoma
authors.forename: Frank J
authors.initials: FJ
authors.lastname: Chaloupka
mesh_terms: D002641:Chicago; D003625:Data Collection / Q000379:methods*; D005502:Food / Q000145:classification / Q000706:statistics & numerical data; D005523:Food Supply; D040541:Marketing; D015203:Reproducibility of Results
keywords: food store; food supply; marketing; reliability