Validity and Reliability of a Self-Administered Food Frequency Questionnaire for the JPHC Study: The Assessment of Amino Acid Intake

J Epidemiol. 2017 May;27(5):242-247. doi: 10.1016/j.je.2016.06.003. Epub 2017 Feb 10.

Abstract

Background: The Japanese database of food amino acid composition was revised in 2010 after a 24-year interval. To examine the impact of the 2010 revision compared with that of the 1986 revision, we evaluated the validity and reliability of amino acid intakes assessed using a food frequency questionnaire (FFQ).

Methods: A FFQ including 138 food items was compared with 7-day dietary records, completed during each distinct season, to assess validity and administered twice at approximately a 1-year interval, to assess reliability. We calculated amino acid intakes using a database that compensated for missing food items via the substitution method. Subjects were a subsample of two cohorts of the Japan Public Health Center-based prospective study. A total of 102 men and 113 women in Cohort I and 174 men and 176 women in Cohort II provided complete dietary records and the FFQ, of whom 101 men and 108 women of Cohort I and 143 men and 146 women of Cohort II completed the FFQ twice.

Results: In the comparison of the FFQ with dietary records, the medians (ranges) of energy-adjusted correlation coefficients for validity were 0.35 (0.25-0.43) among men and 0.29 (0.19-0.40) among women in Cohort I, and 0.37 (0.21-0.52) and 0.38 (0.24-0.59), respectively, in Cohort II. Values for reliability were 0.47 (0.42-0.52) among men and 0.43 (0.38-0.50) among women in Cohort I, and 0.59 (0.52-0.70) and 0.54 (0.45-0.61), respectively, in Cohort II.

Conclusions: The FFQ used in our prospective cohort study is a suitable tool for estimating amino acid intakes.

Keywords: Amino acid intake; Diet; Food frequency questionnaire; Reliability; Validity.

MeSH terms

  • Adult
  • Amino Acids / administration & dosage*
  • Diet Records*
  • Diet Surveys*
  • Energy Intake
  • Feeding Behavior*
  • Female
  • Follow-Up Studies
  • Humans
  • Japan
  • Male
  • Middle Aged
  • Prospective Studies
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Sex Factors
  • Surveys and Questionnaires*

Substances

  • Amino Acids