title: Proposal and validation of a quick question to rate the influence of diet in geriatric epidemiological studies on vitamin d.
abstract: BACKGROUND
  Diet is a major exogenous source of vitamin D. The objective of this analysis was to determine whether the yes/no answer to a simple question exploring diet ("Do you eat fatty fish at least once a week and/or eggs several times per week?") could be associated with serum 25-hydroxy-vitamin D status among 261 older in- and outpatients (mean ± standard deviation, 83.5 ± 8.1 years).
  
  
  METHODS
  Two groups were distinguished based on the binary yes/no answer. Hypovitaminosis D was defined as serum 25-hydroxyvitamin D ≤ 75 nmol/L.
  
  
  RESULTS
  More participants with hypovitaminosis D answered "No" to the question on diet compared to their counterparts (p = 0.002). Answering "No" was associated with hypovitaminosis D (OR = 3.22, p = 0.001) after adjustment for potential confounders, with a positive predictive value = 79 %.
  
  
  CONCLUSIONS
  A simple dietary question may identify older patients with hypovitaminosis D who should receive vitamin D supplements.
authors.affiliation: Medical School, University of Angers, UNAM, Angers, France;
authors.forename: Gaëlle
authors.initials: G
authors.lastname: Chevallereau
authors.affiliation: Medical School, University of Angers, UNAM, Angers, France;
authors.forename: Xavier
authors.initials: X
authors.lastname: Gleyses
authors.affiliation: Medical School, University of Angers, UNAM, Angers, France;
authors.forename: Laurène
authors.initials: L
authors.lastname: Roussel
authors.affiliation: Medical School, University of Angers, UNAM, Angers, France;
authors.forename: Sarah
authors.initials: S
authors.lastname: Hamdan
authors.affiliation: Department of Neuroscience, Division of Geriatric Medicine, Angers University Hospital; Angers University Memory Clinic; UPRES EA 4638, University of Angers, UNAM, Angers, France;
authors.forename: Olivier
authors.initials: O
authors.lastname: Beauchet
authors.affiliation: Department of Neuroscience, Division of Geriatric Medicine, Angers University Hospital; Angers University Memory Clinic; UPRES EA 4638, University of Angers, UNAM, Angers, France;, and Robarts Research Institute, Department of Medical Biophysics, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario, Canada.
authors.forename: Cédric
authors.initials: C
authors.lastname: Annweiler
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000818:Animals; D004032:Diet; D005260:Female; D005399:Fishes; D006801:Humans; D008297:Male; D010063:Ovum; D011795:Surveys and Questionnaires; D014807:Vitamin D / Q000031:analogs & derivatives / Q000097:blood; D014808:Vitamin D Deficiency / Q000097:blood / Q000453:epidemiology*
chemical_list: D014807:Vitamin D; C104450:25-hydroxyvitamin D
keywords: Vitamin D; detection; diet; epidemiology; older adults