Reproducibility and validity of the Diet Quality Index Revised as assessed by use of a food-frequency questionnaire

Background: The Diet Quality Index Revised (DQI-R) is a dietary assessment instrument based on 10 dietary recommendations reflecting dietary guidelines and policy in the United States. Objective: The objective of this study was to assess the reproducibility and validity of the DQI-R as measured by u...

Full description

Saved in:
Bibliographic Details
Published in:The American journal of clinical nutrition 2003-11, Vol.78 (5), p.941-949
Main Authors: Newby, P.K, Hu, Frank B, Rimm, Eric B, Smith-Warner, Stephanie A, Feskanich, Diane, Sampson, Laura, Willett, Walter C
Format: Article
Language:English
Subjects:
Adult
Aged
alpha-carotene
alpha-Tocopherol - blood
beta Carotene - blood
beta-carotene
Biological and medical sciences
biomarkers
blood
Carotenoids - blood
cholesterol
Cholesterol - blood
Diet Records
Dietary Guidelines
Feeding. Feeding behavior
food frequency questionnaires
Fundamental and applied biological sciences. Psychology
health care workers
Humans
issues and policy
lutein
Lutein - blood
Male
men
Middle Aged
Nutrition Assessment
Nutrition Policy
nutritional adequacy
Nutritional Physiological Phenomena
Reproducibility of Results
Surveys and Questionnaires
Vertebrates: anatomy and physiology, studies on body, several organs or systems
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Background: The Diet Quality Index Revised (DQI-R) is a dietary assessment instrument based on 10 dietary recommendations reflecting dietary guidelines and policy in the United States. Objective: The objective of this study was to assess the reproducibility and validity of the DQI-R as measured by use of food-frequency questionnaires (FFQs). Design: Diet was assessed separately by two FFQs at a 1-y interval and by two 1-wk diet records. DQI-R scores were computed from each method. Venous blood specimens were collected for measurement of dietary biomarkers. Participants (n = 127) were men aged 40-75 y in a validation study of the Health Professionals Follow-up Study. Results: Mean DQI-R scores were 69.5 for FFQ-1, 67.2 for FFQ-2, and 62.0 for the diet records out of a possible score of 100. The reproducibility correlation for the 2 FFQ scores was 0.72. Correlations between scores for each of the 2 FFQs and diet records were 0.66 (FFQ-1) and 0.72 (FFQ-2). DQI-R scores from FFQ-2 were directly correlated with plasma biochemical measurements of α-carotene (r = 0.43, P < 0.0005), beta-carotene (r = 0.35, P < 0.005), lutein (r = 0.31, P
ISSN:0002-9165
1938-3207
DOI:10.1093/ajcn/78.5.941