Validation of a short questionnaire for estimating dietary calcium intakes

H. M. MacDonald, A. Garland, J. Burr, A. Strachan, A. D. Wood, Nor Aini Jamil @ A. Wahab, D. McLernon, A. J. Black

Research output: Contribution to journalArticle

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Abstract

Concern about calcium supplements, and mainly minor side effects (e.g. constipation) impacting on compliance, means that assessing dietary calcium intake is important. There is no suitable biomarker. Compared to food diaries, a short questionnaire was an efficient way of confirming that patients had adequate calcium intakes (>700 or >1,000 mg) Introduction: Calcium is usually given alongside treatments for osteoporosis, but recent concerns about potential side effects have led to questioning whether supplements are always necessary. It is difficult to assess calcium intake in a clinical setting and be certain that the patient is getting enough calcium. The aim of this study was to determine whether a short questionnaire for estimating dietary calcium intakes in a clinical setting was fit for purpose. Methods: We assessed dietary calcium intakes using a short questionnaire (CaQ) in patients attending an osteoporosis clinic (n = 117) and compared them with calcium intakes obtained from a 7-day food diary (n = 72) and a food frequency questionnaire (FFQ) (n = 33). Results: Mean (SD) daily calcium intakes from the CaQ were 836 (348) mg; from the diaries, 949 (384) mg; and from the FFQ, 1,141 (387) mg. The positive predictive value (PPV) was >80 % for calcium cut-offs > 700 mg and 70 % for cut-offs > 1,000 mg. The calcium intakes for the false positives results were not far below the cut-off. For 1,200 mg, the PPV was 67 % or less. Conclusion: The CaQ is an adequate tool for assessing whether a patient has daily calcium intakes above 700 or 1,000 mg; if below these cut-offs, it is possible that the patient still has enough calcium in the diet, which could be clarified by questioning the patient further. As there were few patients with calcium intakes above 1,200 mg a day, the CaQ cannot be recommended as a tool for confirming higher dietary calcium intakes.

Original languageEnglish
Pages (from-to)1765-1773
Number of pages9
JournalOsteoporosis International
Volume25
Issue number6
DOIs
Publication statusPublished - 2014
Externally publishedYes

Fingerprint

Dietary Calcium
Calcium
Diet Records
Osteoporosis
Surveys and Questionnaires
Food
Constipation
Compliance

Keywords

  • Dietary calcium
  • Osteoporosis patients
  • Questionnaire
  • Validation

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Medicine(all)

Cite this

MacDonald, H. M., Garland, A., Burr, J., Strachan, A., Wood, A. D., Jamil @ A. Wahab, N. A., ... Black, A. J. (2014). Validation of a short questionnaire for estimating dietary calcium intakes. Osteoporosis International, 25(6), 1765-1773. https://doi.org/10.1007/s00198-014-2694-5

Validation of a short questionnaire for estimating dietary calcium intakes. / MacDonald, H. M.; Garland, A.; Burr, J.; Strachan, A.; Wood, A. D.; Jamil @ A. Wahab, Nor Aini; McLernon, D.; Black, A. J.

In: Osteoporosis International, Vol. 25, No. 6, 2014, p. 1765-1773.

Research output: Contribution to journalArticle

MacDonald, HM, Garland, A, Burr, J, Strachan, A, Wood, AD, Jamil @ A. Wahab, NA, McLernon, D & Black, AJ 2014, 'Validation of a short questionnaire for estimating dietary calcium intakes', Osteoporosis International, vol. 25, no. 6, pp. 1765-1773. https://doi.org/10.1007/s00198-014-2694-5
MacDonald, H. M. ; Garland, A. ; Burr, J. ; Strachan, A. ; Wood, A. D. ; Jamil @ A. Wahab, Nor Aini ; McLernon, D. ; Black, A. J. / Validation of a short questionnaire for estimating dietary calcium intakes. In: Osteoporosis International. 2014 ; Vol. 25, No. 6. pp. 1765-1773.
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