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Inaccuracy of self-reported low sodium diet.
MedLine Citation:
PMID:  22238239     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVES: This study evaluates how often the self-report of a low sodium (Na) intake is reflected by a low 24-h urinary sodium excretion and examines the influence of incomplete urinary collections on this comparison. METHODS: In a study in which 24-h urine collections were obtained for measurement of Na and creatinine excretion, 120 participants were asked whether their Na intake was low, medium, or high. A 24-h urine collection was considered complete if creatinine excretion was ≥20 mg/kg in men or ≥15 mg/kg in women, and incomplete if below those amounts. The kappa statistic was computed to assess the level of agreement between 24-h Na excretion, dichotomized at 100 meq and self-report responses. RESULTS: Agreement between self-reported and actual Na excretion was poor. The kappa statistic was 0.18 for the total sample, 0.04 for complete collectors, and 0.51 for incomplete collectors, respectively. Overall, 24-h Na excretion exceeded 100 meq among 75% of those reporting an average or high Na intake, but it also exceeded 100 meq among 57% of those reporting a low sodium intake. Further, among those reporting a low sodium intake, Na excretion exceeded 100 meq in 80% of those who submitted a complete collection, but in only 29% of those who submitted an incomplete collection. CONCLUSIONS: These findings suggest that many individuals who report a low salt diet actually excrete ≥100 meq/day. Na intake is also frequently underestimated because many 24-h urine collections are incomplete. Am. J. Hum. Biol., 2012. © 2012 Wiley Periodicals, Inc.
Authors:
Linda M Gerber; Samuel J Mann
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-12
Journal Detail:
Title:  American journal of human biology : the official journal of the Human Biology Council     Volume:  -     ISSN:  1520-6300     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-1-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8915029     Medline TA:  Am J Hum Biol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Wiley Periodicals, Inc.
Affiliation:
Department of Public Health, Weill Cornell Medical College, New York, New York 10065; Division of Nephrology and Hypertension, Department of Medicine, Weill Cornell Medical College, New York, New York 10021. lig2002@med.cornell.edu.
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