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Evaluation of a web-based, pictorial diet history questionnaire

  • Jeannette M Beasley (a1) (a2) (a3), Amanda Davis (a1) and William T Riley (a1)
Abstract
AbstractObjective

To develop and evaluate a pictorial, web-based version of the NCI diet history questionnaire (Web-PDHQ).

Design

The Web-PDHQ and paper version of the DHQ (Paper-DHQ) were administered 4 weeks apart with 218 participants randomised to order. Dietary data from the Web-PDHQ and Paper-DHQ were validated using a randomly selected 4 d food record recording period (including a weekend day) and two randomly selected 24 h dietary recalls during the 4 weeks intervening between these two diet history administrations.

Setting

Research office in Reston, VA, USA.

Participa414ts

Computer-literate men and women recruited through newspaper advertisements.

Results

Mean correlation of energy and the twenty-five examined nutrients between the Web-PDHQ and Paper-DHQ was 0·71 and 0·51, unadjusted and energy-adjusted by the residual method, respectively. Moderate mean correlations (unadjusted 0·41 and 0·38; energy-adjusted 0·41 and 0·34) were obtained between both the Web-PDHQ and Paper-DHQ with the 4 d food record on energy and nutrients, but the correlations between the Web-PDHQ and Paper-DHQ with the 24 h recalls were modest (unadjusted 0·31 and 0·29; energy-adjusted 0·37 and 0·26). A subset of participants (n 48) completing the Web-PDHQ at the initial visit performed a retest on the same questionnaire 1 week later to determine repeatability, and the unadjusted mean correlation was 0·82.

Conclusions

These data indicate that the Web-PDHQ has comparable repeatability and validity to the Paper-DHQ but did not improve the relationship of the DHQ to other food intake measures (e.g. food records, 24 h recall).

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Copyright
Corresponding author
*Corresponding author: Email beasley.j@ghc.org
References
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Public Health Nutrition
  • ISSN: 1368-9800
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