Document Detail

Validation of a food frequency questionnaire for assessment of calcium and bone-related nutrient intake in rural populations.
MedLine Citation:
PMID:  17659902     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To assess the ability of a semiquantitative food frequency questionnaire (FFQ) to measure calcium and bone-related nutrient intakes in a rural South Dakota population. DESIGN: Intake estimates from FFQ were compared with four 24-hour recalls obtained quarterly during the preceding year. SUBJECTS: Convenience sample of 100 participants of the South Dakota Rural Bone Health Study were recruited, with 81 completing the FFQ. MAIN OUTCOME MEASURES: Calcium and bone-related nutrient intakes were expressed as milligrams per day, milligrams per 1,000 kcal, or quartiles. STATISTICAL ANALYSES PERFORMED: Intakes by FFQ and 24-hour recalls were compared using paired t test and quartiles were formed to examine cross-classification. RESULTS: Calcium intakes from FFQ and recalls were 1,287 and 1,141 mg/day (P=0.01), but calcium per 1,000 kcal did not differ. Calcium intake by FFQ correlated with intake by recall when expressed as milligrams per day (r=0.49, P<0.001) or milligrams per 1,000 kcal (r=0.59, P<0.001). Bland-Altman graphs indicated fairly good agreement between methods. Seventy-eight percent of subjects fell into the same or within one quartile category when calcium intake was expressed as milligrams per day and 83% when expressed as milligrams per 1,000 kcal. Gross misclassification occurred in 0% to 4% of the nutrients. CONCLUSIONS: Although FFQ may not be a valid indicator of an individual's intake, it does adequately classify rural populations into quartiles of calcium and bone-related nutrient intakes, making it a useful tool for assessing dietary calcium and bone related intake in rural populations.
Jane M Osowski; Tianna Beare; Bonny Specker
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Validation Studies    
Journal Detail:
Title:  Journal of the American Dietetic Association     Volume:  107     ISSN:  0002-8223     ISO Abbreviation:  J Am Diet Assoc     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-07-30     Completed Date:  2007-09-11     Revised Date:  2007-12-03    
Medline Journal Info:
Nlm Unique ID:  7503061     Medline TA:  J Am Diet Assoc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1349-55     Citation Subset:  AIM; IM    
EA Martin Program in Human Nutrition, Box 2204, EAM Bldg, South Dakota State University, Brookings, SD 57007, USA.
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MeSH Terms
Bone Density Conservation Agents / administration & dosage*
Bone and Bones / metabolism*
Calcium, Dietary / administration & dosage*
Diet Surveys
Energy Intake / physiology
Longitudinal Studies
Magnesium / administration & dosage
Mental Recall
Middle Aged
Nutrition Assessment
Phosphorus, Dietary / administration & dosage
Questionnaires / standards*
Reproducibility of Results
Rural Population
Sensitivity and Specificity
South Dakota
Vitamin D / administration & dosage
Grant Support
Reg. No./Substance:
0/Bone Density Conservation Agents; 0/Calcium, Dietary; 0/Phosphorus, Dietary; 1406-16-2/Vitamin D; 7439-95-4/Magnesium

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

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