Document Detail


Predictors of selenium concentration in human toenails.
MedLine Citation:
PMID:  2356804     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To assess the validity of the selenium concentration in human toenails as a measure of selenium intake and to determine other correlates of toenail selenium level, the authors examined the predictors of toenail selenium within two subgroups of a large cohort study of US women. Mean toenail selenium was higher among 38 consumers of selenium supplements (0.904 micrograms/g, standard deviation (SD) 0.217) than among 96 nonusers (0.748 micrograms/g, SD 0.149; p less than 0.001), and a dose-response relation was observed among supplement users (Spearman's r = 0.32; p = 0.05). In a second subgroup of 677 women, selenium supplement use was also associated with higher mean toenail selenium (0.906 micrograms/g, SD 0.214, among 18 users and 0.801 micrograms/g, SD 0.148, among 659 nonusers; p = 0.02), and the dose-response relation was also significant (Spearman's r = 0.50; p = 0.03). The geographic variation in toenail selenium levels was consistent with the geographic distribution of selenium in forage crops. Toenail selenium declined with age and was significantly reduced among cigarette smokers (mean = 0.746, SD 0.124, among 146 current smokers and mean = 0.817, SD 0.159, among 311 never smokers; p less than 0.001) but was not materially affected by alcohol consumption. A dietary selenium score calculated from a food frequency questionnaire failed to predict toenail selenium level, demonstrating the suspected inability of diet questionnaires to measure individual selenium intake because of the highly variable selenium composition of different samples of the same food.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
D J Hunter; J S Morris; C G Chute; E Kushner; G A Colditz; M J Stampfer; F E Speizer; W C Willett
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  American journal of epidemiology     Volume:  132     ISSN:  0002-9262     ISO Abbreviation:  Am. J. Epidemiol.     Publication Date:  1990 Jul 
Date Detail:
Created Date:  1990-07-20     Completed Date:  1990-07-20     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7910653     Medline TA:  Am J Epidemiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  114-22     Citation Subset:  IM    
Affiliation:
Department of Medicine, Harvard Medical School, Boston, MA.
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MeSH Terms
Descriptor/Qualifier:
Adult
Age Factors
Aged
Cohort Studies
Female
Food Supply / standards
Humans
Middle Aged
Nails / analysis*
Nutrition Surveys*
Questionnaires
Reproducibility of Results
Selenium / analysis*,  deficiency,  therapeutic use
Smoking / adverse effects
Soil / analysis
Toes
United States
Grant Support
ID/Acronym/Agency:
CA 40356/CA/NCI NIH HHS; CA 40956/CA/NCI NIH HHS
Chemical
Reg. No./Substance:
0/Soil; 7782-49-2/Selenium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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