{"id":48898,"date":"2006-04-01T00:00:00","date_gmt":"2018-12-04T03:47:25","guid":{"rendered":"https:\/\/aprifel-pp.mentalworks.biz\/fr\/resume-scientifique\/validity-and-systematic-error-in-measuring-carotenoid-consumption\/"},"modified":"2018-12-04T04:47:25","modified_gmt":"2018-12-04T03:47:25","slug":"validity-and-systematic-error-in-measuring-carotenoid-consumption","status":"publish","type":"resume","link":"https:\/\/aprifel-pp.mentalworks.biz\/fr\/resume-scientifique\/validity-and-systematic-error-in-measuring-carotenoid-consumption\/","title":{"rendered":"Validity and systematic error in measuring carotenoid consumption with dietary self-report instruments."},"content":{"rendered":"

Vegetables and fruits are rich in carotenoids, a group of compounds thought to protect against cancer. Studies of diet-disease associations need valid and reliable instruments for measuring dietary intake. The authors present a measurement error model to estimate the validity (defined as correlation between self-reported intake and \u00ab\u00a0true\u00a0\u00bb intake), systematic error, and reliability of two self-report dietary assessment methods. Carotenoid exposure is measured by repeated 24-hour recalls, a food frequency questionnaire (FFQ), and a plasma marker. The model is applied to 1,013 participants assigned between 1995 and 2000 to the nonintervention arm of the Women’s Healthy Eating and Living Study, a randomized trial assessing the impact of a low-fat, high-vegetable\/fruit\/fiber diet on preventing new breast cancer events. Diagnostics including graphs are used to assess the goodness of fit. The validity of the instruments was 0.44 for the 24-hour recalls and 0.39 for the FFQ. Systematic error accounted for over 22% and 50% of measurement error variance for the 24-hour recalls and FFQ, respectively. The use of either self-report method alone in diet-disease studies could lead to substantial bias and error. Multiple methods of dietary assessment may provide more accurate estimates of true dietary intake.<\/p>\n","protected":false},"template":"","mots_cles":[],"class_list":["post-48898","resume","type-resume","status-publish","hentry"],"acf":{"adresse":"Division of Biostatistics, University of California, La Jolla, CA, USA. loki@math.ucsd.edu\r\n","annee":"2006","mois":"4","numero":"163:8","page":"770-8","auteurs":[{"ID":14301,"post_author":"0","post_date":"2018-12-03 19:08:08","post_date_gmt":"2018-12-03 18:08:08","post_content":"","post_title":"John P Pierce","post_excerpt":"","post_status":"publish","comment_status":"closed","ping_status":"closed","post_password":"","post_name":"john-p-pierce","to_ping":"","pinged":"","post_modified":"2018-12-03 19:08:08","post_modified_gmt":"2018-12-03 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