Document Detail


Development and validation of a short questionnaire to assess sodium intake.
MedLine Citation:
PMID:  17582243     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: To develop and validate a short food-frequency questionnaire to assess habitual dietary salt intake in South Africans and to allow classification of individuals according to intakes above or below the maximum recommended intake of 6 g salt day-1. DESIGN: Cross-sectional validation study in 324 conveniently sampled men and women. METHODS: Repeated 24-hour urinary Na values and 24-hour dietary recalls were obtained on three occasions. Food items consumed by >5% of the sample and which contributed > or =50 mg Na serving-1 were included in the questionnaire in 42 categories. A scoring system was devised, based on Na content of one index food per category and frequency of consumption. RESULTS: Positive correlations were found between Na content of 35 of the 42 food categories in the questionnaire and total Na intake, calculated from 24-hour recall data. Total Na content of the questionnaire was associated with Na estimations from 24-hour recall data (r = 0.750; P < 0.0001; n = 328) and urinary Na (r = 0.152; P = 0.0105; n = 284). Urinary Na was higher for subjects in tertile 3 than tertile 1 of questionnaire Na content (P < 0.05). Questionnaire Na content of <2400 and > or =2400 mg day-1 equated to a reference cut-off score of 48 and corresponded to mean (standard deviation) urinary Na values of 145 (68) and 176 (99) mmol day-1, respectively (P < 0.05). Sensitivity and specificity against urinary Na > or =100 and <100 mmol day-1 was 12.4% and 93.9%, respectively. CONCLUSION: A 42-item food-frequency questionnaire has been shown to have content-, construct- and criterion-related validity, as well as internal consistency, with regard to categorising individuals according to their habitual salt intake; however, the devised scoring system needs to show improved sensitivity.
Authors:
Karen E Charlton; Krisela Steyn; Naomi S Levitt; Deborah Jonathan; Jabulisiwe V Zulu; Johanna H Nel
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Validation Studies     Date:  2007-06-21
Journal Detail:
Title:  Public health nutrition     Volume:  11     ISSN:  1368-9800     ISO Abbreviation:  Public Health Nutr     Publication Date:  2008 Jan 
Date Detail:
Created Date:  2007-12-10     Completed Date:  2008-04-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9808463     Medline TA:  Public Health Nutr     Country:  England    
Other Details:
Languages:  eng     Pagination:  83-94     Citation Subset:  IM    
Affiliation:
Chronic Diseases of Lifestyle Unit, Medical Research Council, Tygerberg, South Africa. karenc@uow.edu.au
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MeSH Terms
Descriptor/Qualifier:
Adult
African Continental Ancestry Group
Aged
Blood Pressure
Case-Control Studies
Cross-Sectional Studies
Diet Records*
Female
Humans
Hypertension
Male
Middle Aged
Nutrition Assessment*
Questionnaires / standards*
Sensitivity and Specificity
Sodium, Dietary / administration & dosage*,  analysis,  classification*,  urine
South Africa
Chemical
Reg. No./Substance:
0/Sodium, Dietary

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