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A methodological report from the Malmö Diet and Cancer study: development and evaluation of altered routines in dietary data processing

Wirfält, Elisabet LU ; Mattison, Irene; Johansson, Ulla LU ; Gullberg, Bo LU ; Wallström, Peter LU and Berglund, Göran LU (2002) In Nutrition Journal 1(3).
Abstract
Background: In the Malmö Diet and Cancer study, information on dietary habits was obtained

through a modified diet history method, combining a 7-day menu book for cooked meals and a diet

questionnaire for foods with low day-to-day variation. Half way through the baseline data

collection, a change of interview routines was implemented in order to reduce interview time.

Methods: Changes concentrated on portion-size estimation and recipe coding of mixed dishes

reported in the menu book. All method development and tests were carefully monitored, based

on experiential knowledge, and supplemented with empirical data. A post hoc evaluation study using

"real world" data compared... (More)
Background: In the Malmö Diet and Cancer study, information on dietary habits was obtained

through a modified diet history method, combining a 7-day menu book for cooked meals and a diet

questionnaire for foods with low day-to-day variation. Half way through the baseline data

collection, a change of interview routines was implemented in order to reduce interview time.

Methods: Changes concentrated on portion-size estimation and recipe coding of mixed dishes

reported in the menu book. All method development and tests were carefully monitored, based

on experiential knowledge, and supplemented with empirical data. A post hoc evaluation study using

"real world" data compared observed means of selected dietary variables before and after the

alteration of routines handling dietary data, controlling for potential confounders.

Results: These tests suggested that simplified coding rules and standard portion-sizes could be

used on a limited number of foods, without distortions of the group mean nutrient intakes, or the

participants' ranking. The post hoc evaluation suggested that mean intakes of energy-adjusted fat

were higher after the change in routines. The impact appeared greater in women than in men.

Conclusions: Future descriptive studies should consider selecting subsets assessed with either

method version to avoid distortion of observed mean intakes. The impact in analytical studies may

be small, because method version and diet assistant explained less than 1 percent of total variation.

The distribution of cases and non-cases across method versions should be monitored. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nutrition Journal
volume
1
issue
3
publisher
BioMed Central
ISSN
1475-2891
DOI
10.1186/1475-2891-1-3
language
English
LU publication?
yes
id
83bbe12b-19e2-48b5-b6a3-bbb5ea1dd261 (old id 111806)
date added to LUP
2007-07-20 15:59:41
date last changed
2016-04-16 04:18:24
@article{83bbe12b-19e2-48b5-b6a3-bbb5ea1dd261,
  abstract     = {Background: In the Malmö Diet and Cancer study, information on dietary habits was obtained<br/><br>
through a modified diet history method, combining a 7-day menu book for cooked meals and a diet<br/><br>
questionnaire for foods with low day-to-day variation. Half way through the baseline data<br/><br>
collection, a change of interview routines was implemented in order to reduce interview time.<br/><br>
Methods: Changes concentrated on portion-size estimation and recipe coding of mixed dishes<br/><br>
reported in the menu book. All method development and tests were carefully monitored, based<br/><br>
on experiential knowledge, and supplemented with empirical data. A post hoc evaluation study using<br/><br>
"real world" data compared observed means of selected dietary variables before and after the<br/><br>
alteration of routines handling dietary data, controlling for potential confounders.<br/><br>
Results: These tests suggested that simplified coding rules and standard portion-sizes could be<br/><br>
used on a limited number of foods, without distortions of the group mean nutrient intakes, or the<br/><br>
participants' ranking. The post hoc evaluation suggested that mean intakes of energy-adjusted fat<br/><br>
were higher after the change in routines. The impact appeared greater in women than in men.<br/><br>
Conclusions: Future descriptive studies should consider selecting subsets assessed with either<br/><br>
method version to avoid distortion of observed mean intakes. The impact in analytical studies may<br/><br>
be small, because method version and diet assistant explained less than 1 percent of total variation.<br/><br>
The distribution of cases and non-cases across method versions should be monitored.},
  author       = {Wirfält, Elisabet and Mattison, Irene and Johansson, Ulla and Gullberg, Bo and Wallström, Peter and Berglund, Göran},
  issn         = {1475-2891},
  language     = {eng},
  number       = {3},
  publisher    = {BioMed Central},
  series       = {Nutrition Journal},
  title        = {A methodological report from the Malmö Diet and Cancer study: development and evaluation of altered routines in dietary data processing},
  url          = {http://dx.doi.org/10.1186/1475-2891-1-3},
  volume       = {1},
  year         = {2002},
}