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Reliability and validity of a short form household food security scale in a Caribbean community.
BMC Public Health. 2004 Jun 16; 4:22.BP

Abstract

BACKGROUND

We evaluated the reliability and validity of the short form household food security scale in a different setting from the one in which it was developed.

METHODS

The scale was interview administered to 531 subjects from 286 households in north central Trinidad in Trinidad and Tobago, West Indies. We evaluated the six items by fitting item response theory models to estimate item thresholds, estimating agreement among respondents in the same households and estimating the slope index of income-related inequality (SII) after adjusting for age, sex and ethnicity.

RESULTS

Item-score correlations ranged from 0.52 to 0.79 and Cronbach's alpha was 0.87. Item responses gave within-household correlation coefficients ranging from 0.70 to 0.78. Estimated item thresholds (standard errors) from the Rasch model ranged from -2.027 (0.063) for the 'balanced meal' item to 2.251 (0.116) for the 'hungry' item. The 'balanced meal' item had the lowest threshold in each ethnic group even though there was evidence of differential functioning for this item by ethnicity. Relative thresholds of other items were generally consistent with US data. Estimation of the SII, comparing those at the bottom with those at the top of the income scale, gave relative odds for an affirmative response of 3.77 (95% confidence interval 1.40 to 10.2) for the lowest severity item, and 20.8 (2.67 to 162.5) for highest severity item. Food insecurity was associated with reduced consumption of green vegetables after additionally adjusting for income and education (0.52, 0.28 to 0.96).

CONCLUSIONS

The household food security scale gives reliable and valid responses in this setting. Differing relative item thresholds compared with US data do not require alteration to the cut-points for classification of 'food insecurity without hunger' or 'food insecurity with hunger'. The data provide further evidence that re-evaluation of the 'balanced meal' item is required.

Authors+Show Affiliations

Department of Public Health Sciences, King's College London. martin.gulliford@kcl.ac.ukNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Validation Study

Language

eng

PubMed ID

15200684

Citation

Gulliford, Martin C., et al. "Reliability and Validity of a Short Form Household Food Security Scale in a Caribbean Community." BMC Public Health, vol. 4, 2004, p. 22.
Gulliford MC, Mahabir D, Rocke B. Reliability and validity of a short form household food security scale in a Caribbean community. BMC Public Health. 2004;4:22.
Gulliford, M. C., Mahabir, D., & Rocke, B. (2004). Reliability and validity of a short form household food security scale in a Caribbean community. BMC Public Health, 4, 22.
Gulliford MC, Mahabir D, Rocke B. Reliability and Validity of a Short Form Household Food Security Scale in a Caribbean Community. BMC Public Health. 2004 Jun 16;4:22. PubMed PMID: 15200684.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Reliability and validity of a short form household food security scale in a Caribbean community. AU - Gulliford,Martin C, AU - Mahabir,Deepak, AU - Rocke,Brian, Y1 - 2004/06/16/ PY - 2003/10/23/received PY - 2004/06/16/accepted PY - 2004/6/18/pubmed PY - 2004/8/24/medline PY - 2004/6/18/entrez SP - 22 EP - 22 JF - BMC public health JO - BMC Public Health VL - 4 N2 - BACKGROUND: We evaluated the reliability and validity of the short form household food security scale in a different setting from the one in which it was developed. METHODS: The scale was interview administered to 531 subjects from 286 households in north central Trinidad in Trinidad and Tobago, West Indies. We evaluated the six items by fitting item response theory models to estimate item thresholds, estimating agreement among respondents in the same households and estimating the slope index of income-related inequality (SII) after adjusting for age, sex and ethnicity. RESULTS: Item-score correlations ranged from 0.52 to 0.79 and Cronbach's alpha was 0.87. Item responses gave within-household correlation coefficients ranging from 0.70 to 0.78. Estimated item thresholds (standard errors) from the Rasch model ranged from -2.027 (0.063) for the 'balanced meal' item to 2.251 (0.116) for the 'hungry' item. The 'balanced meal' item had the lowest threshold in each ethnic group even though there was evidence of differential functioning for this item by ethnicity. Relative thresholds of other items were generally consistent with US data. Estimation of the SII, comparing those at the bottom with those at the top of the income scale, gave relative odds for an affirmative response of 3.77 (95% confidence interval 1.40 to 10.2) for the lowest severity item, and 20.8 (2.67 to 162.5) for highest severity item. Food insecurity was associated with reduced consumption of green vegetables after additionally adjusting for income and education (0.52, 0.28 to 0.96). CONCLUSIONS: The household food security scale gives reliable and valid responses in this setting. Differing relative item thresholds compared with US data do not require alteration to the cut-points for classification of 'food insecurity without hunger' or 'food insecurity with hunger'. The data provide further evidence that re-evaluation of the 'balanced meal' item is required. SN - 1471-2458 UR - https://www.unboundmedicine.com/medline/citation/15200684/Reliability_and_validity_of_a_short_form_household_food_security_scale_in_a_Caribbean_community_ L2 - https://bmcpublichealth.biomedcentral.com/articles/10.1186/1471-2458-4-22 DB - PRIME DP - Unbound Medicine ER -