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Eur J Clin Nutr. 2004 Dec;58(12):1669-71.

Sensitivity and specificity of self-reported use of dietary supplements.

Author information

  • 1Department of Nutritional Epidemiology, National Institute of Environmental Medicine, Stockholm, Sweden. maria.messerer@imm.ki.se

Abstract

OBJECTIVE:

To evaluate the sensitivity and specificity of a self-administered food frequency questionnaire (FFQ)-used in a cohort of 48,000 men to determine dietary supplement use.

DESIGN:

Questionnaire data regarding use of dietary supplements were compared with 14 24-h recall interviews spread over a year.

SETTING AND SUBJECTS:

A random sample of 248 middle-aged and elderly Swedish men was included in the analysis.

RESULTS AND CONCLUSIONS:

Use of any supplement in at least one interview was reported by 51% (in three or more interviews by 38%). Sensitivity and specificity of the FFQ regarding any supplement use was 78 and 93%, respectively. Sensitivity for multivitamins, vitamins C and E was 69, 67 and 78%, respectively. The sensitivity increased to 93% and the specificity decreased to 88% when a user was defined as a person reporting use in at least three interviews.

CONCLUSIONS:

Dietary supplement use might be measured by a self-administered questionnaire relatively well especially when supplements are used more regularly.

[PubMed - indexed for MEDLINE]
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