Original Article
European Journal of Clinical Nutrition (2008) 62, 665–673; doi:10.1038/sj.ejcn.1602760; published online 18 April 2007
Psychometric properties of a modified US-household food security survey module in Campinas, Brazil
Contributors: HRM-Q led the data analysis, as well as the writing of the article; MN was senior analysis advisor in the Rasch modeling, giving major advice contributions to the interpretation of results; RP-E is a co-Principal Investigator in the validation research on the food security scale in Campinas, playing a major role in the discussion of the findings; AMS-C was the principal investigator in the food security scale validation study in Campinas, giving crucial advice in the interpretation of the results within the Brazilian context.
The views expressed in this article may not be attributed to the Economic Research Service or the US Department of Agriculture.
H R Melgar-Quinonez1, M Nord2, R Perez-Escamilla3 and A M Segall-Correa4
- 1Department of Human Nutrition, The Ohio State University, Columbus, OH, USA
- 2Economic Research Service – US Department of Agriculture, Washington, DC, USA
- 3Department of Nutritional Sciences and Connecticut NIH EXPORT Center of Excellence for Eliminating Heath Disparities among Latinos, University of Connecticut, Storrs, CT, USA
- 4Department of Social and Preventive Medicine, University of Campinas, Sao Paulo, Brazil
Correspondence: Dr HR Melgar-Quiñonez, Human Nutrition Department, The Ohio State University, 1787 Neil Avenue, Columbus, OH 43210, USA. E-mail: melgar-quinonez.1@osu.edu
Received 8 November 2006; Revised 2 February 2007; Accepted 8 March 2007; Published online 18 April 2007.
Abstract
Objective:
To assess the internal validity of a multiple-item measure of household food security in Brazil using statistical methods based on the single-parameter logistic (Rasch) measurement model.
Subjects/Methods:
Sample of the non-institutionalized civilian population living in the municipality of Campinas selected using stratified cluster sampling. Of the 1000 households randomly chosen, 847 responded to the interview. Responses to each of the 15 questions were coded into dichotomous items indicating whether the specific food-insecure condition had occurred (other than in just 1 or 2 days) during the 3 months before the survey. Scaling analyses were conducted separately as well as jointly for adult/household-related items and child-related items. Item-fit statistics were examined to determine the extent to which the items appear to measure the same underlying phenomenon, and item severity scores were compared with those of equivalent items in the US Current Population Survey.
Results:
Except for one item, infit statistics were within a range considered adequate (0.80–1.2), indicating a common phenomenon being measured with approximately equal discrimination. The relative severites of the items in the Campinas survey were generally similar to those of equivalent items in the US Current Population Survey. Analysis of all 15 items together indicates a higher severity level for child-related items compared with equivalent adult-related items.
Conclusions:
This analysis will serve as the prototype for confirming the psychometric validity of a food insecurity scale at a national level.
Keywords:
food security, rasch model, internal validity, Brazil
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