title: Internal validity of a household food security scale is consistent among diverse populations participating in a food supplement program in Colombia.
abstract: OBJECTIVE
  We assessed the validity of a locally adapted Colombian Household Food Security Scale (CHFSS) used as a part of the 2006 evaluation of the food supplement component of the Plan for Improving Food and Nutrition in Antioquia, Colombia (MANA - Plan Departamental de Seguridad Alimentaria y Nutricional de Antioquia).
  
  
  METHODS
  Subjects included low-income families with pre-school age children in MANA that responded affirmatively to at least one CHFSS item (n = 1,319). Rasch Modeling was used to evaluate the psychometric characteristics of the items through measure and INFIT values. Differences in CHFSS performance were assessed by area of residency, socioeconomic status and number of children enrolled in MANA. Unidimensionality of a scale by group was further assessed using Differential Item Functioning (DIF).
  
  
  RESULTS
  Most CHFSS items presented good fitness with most INFIT values within the adequate range of 0.8 to 1.2. Consistency in item measure values between groups was found for all but two items in the comparison by area of residency. Only two adult items exhibited DIF between urban and rural households.
  
  
  CONCLUSIONS
  The results indicate that the adapted CHFSS is a valid tool to assess the household food security of participants in food assistance programs like MANA.
authors.affiliation: Department of Human Nutrition, The Ohio State University, Columbus, Ohio, USA. hackett.164@osu.edu
authors.forename: Michelle
authors.initials: M
authors.lastname: Hackett
authors.forename: Hugo
authors.initials: H
authors.lastname: Melgar-Quinonez
authors.forename: Martha C Alvarez
authors.initials: MC
authors.lastname: Uribe
mesh_terms: D000328:Adult; D002648:Child; D003105:Colombia; D003430:Cross-Sectional Studies; D005522:Food Services; D005523:Food Supply; D006801:Humans; D006815:Hunger; D015233:Models, Statistical; D015596:Nutrition Assessment; D011203:Poverty; D015397:Program Evaluation; D011594:Psychometrics; D011632:Public Assistance; D012111:Residence Characteristics / Q000706:statistics & numerical data*; D012424:Rural Population / Q000706:statistics & numerical data; D012923:Social Class; D014505:Urban Population / Q000706:statistics & numerical data