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The study population: general characteristics and potential confounding factors.

Authors
  • Brussaard, J H
  • Brants, H A
  • Bouman, M
  • Löwik, M R
Type
Published Article
Journal
European Journal of Clinical Nutrition
Publisher
Springer Nature
Publication Date
Nov 01, 1997
Volume
51 Suppl 3
Identifiers
PMID: 9598764
Source
Medline
License
Unknown

Abstract

The non-response rate for the food frequency questionnaire was 54%; subsequently, non-response for the detail study was 42%. A greater proportion of respondents to the FFQ and of participants in the reference group of the study followed a special dietary regimen or a therapeutic diet or used dietary supplements compared with non-respondents, indicating that we may have selected a somewhat more health conscious reference group. There were no differences in vitamin B6 intake (absolute or per g protein) between participants and the total group of non-respondents for the detail study. Selection of a low B6 group did not result in important bias regarding physical, biochemical or general health and lifestyle characteristics. Exceptions were a difference in the proportion of dieters (younger women) and supplement users (older women) and a difference in creatinine clearance and supplement use between reference and low B6 groups. The differences found, however, were small. Nonetheless, these factors have to be taken into account when analysing and interpreting the results.

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