dc.contributor.author | Newby, P. K. | |
dc.contributor.author | Hu, Frank B. | |
dc.contributor.author | Rimm, Eric Bruce::0ab2926c8242f35e5a982e3cf59f4987::600 | |
dc.contributor.author | Smith-Warner, Stephanie A. | |
dc.contributor.author | Feskanich, Diane | |
dc.contributor.author | Sampson, Laura | |
dc.contributor.author | Willett, Walter C.::94559ea206eef8a8844fc5b80654fa5b::600 | |
dc.date.accessioned | 2019-08-26T16:11:16Z | |
dc.date.issued | 2003 | |
dc.identifier.citation | Newby, PK, Frank B Hu, Eric B Rimm, Stephanie A Smith-Warner, Diane Feskanich, Laura Sampson, and Walter C Willett. 2003. “Reproducibility and Validity of the Diet Quality Index Revised as Assessed by Use of a Food-Frequency Questionnaire.” The American Journal of Clinical Nutrition 78 (5): 941–49. https://doi.org/10.1093/ajcn/78.5.941. | |
dc.identifier.issn | 0002-9165 | |
dc.identifier.issn | 1938-3207 | |
dc.identifier.uri | http://nrs.harvard.edu/urn-3:HUL.InstRepos:41249130 | * |
dc.description.abstract | 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 alpha-carotene (r = 0.43, P < 0.0005), beta-carotene (r = 0.35, P < 0.005), lutein (r = 0.31, P < 0.005), and alpha-tocopherol (r = 0.25, P < 0.05) and were inversely correlated with plasma total cholesterol (r = -0.22, P < 0.05). Conclusions: These data indicate reasonable reproducibility and validity of the DQI-R as assessed by an FFQ. Future studies are needed to examine whether this index and other instruments of diet quality can reliably predict disease outcomes. | |
dc.language.iso | en_US | |
dc.publisher | Oxford University Press | |
dash.license | META_ONLY | |
dc.title | Reproducibility and validity of the Diet Quality Index Revised as assessed by use of a food-frequency questionnaire | |
dc.type | Journal Article | |
dc.description.version | Version of Record | |
dc.relation.journal | American Journal of Clinical Nutrition | |
dash.depositing.author | Rimm, Eric Bruce::0ab2926c8242f35e5a982e3cf59f4987::600 | |
dc.date.available | 2019-08-26T16:11:16Z | |
dash.workflow.comments | 1Science Serial ID 1508 | |
dc.identifier.doi | 10.1093/ajcn/78.5.941 | |
dash.source.volume | 78;5 | |
dash.source.page | 941-949 | |