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Validation of a food frequency questionnaire for assessment of calcium and bone-related nutrient intake in rural populations.
J Am Diet Assoc. 2007 Aug; 107(8):1349-55.JA

Abstract

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.

Authors+Show Affiliations

EA Martin Program in Human Nutrition, Box 2204, EAM Bldg, South Dakota State University, Brookings, SD 57007, USA.No affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, N.I.H., Extramural
Validation Study

Language

eng

PubMed ID

17659902

Citation

Osowski, Jane M., et al. "Validation of a Food Frequency Questionnaire for Assessment of Calcium and Bone-related Nutrient Intake in Rural Populations." Journal of the American Dietetic Association, vol. 107, no. 8, 2007, pp. 1349-55.
Osowski JM, Beare T, Specker B. Validation of a food frequency questionnaire for assessment of calcium and bone-related nutrient intake in rural populations. J Am Diet Assoc. 2007;107(8):1349-55.
Osowski, J. M., Beare, T., & Specker, B. (2007). Validation of a food frequency questionnaire for assessment of calcium and bone-related nutrient intake in rural populations. Journal of the American Dietetic Association, 107(8), 1349-55.
Osowski JM, Beare T, Specker B. Validation of a Food Frequency Questionnaire for Assessment of Calcium and Bone-related Nutrient Intake in Rural Populations. J Am Diet Assoc. 2007;107(8):1349-55. PubMed PMID: 17659902.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Validation of a food frequency questionnaire for assessment of calcium and bone-related nutrient intake in rural populations. AU - Osowski,Jane M, AU - Beare,Tianna, AU - Specker,Bonny, PY - 2006/04/10/received PY - 2007/7/31/pubmed PY - 2007/9/12/medline PY - 2007/7/31/entrez SP - 1349 EP - 55 JF - Journal of the American Dietetic Association JO - J Am Diet Assoc VL - 107 IS - 8 N2 - 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. SN - 0002-8223 UR - https://www.unboundmedicine.com/medline/citation/17659902/Validation_of_a_food_frequency_questionnaire_for_assessment_of_calcium_and_bone_related_nutrient_intake_in_rural_populations_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0002-8223(07)00735-3 DB - PRIME DP - Unbound Medicine ER -