Barbara Dennis|Jeremiah Stamler|M Buzzard|Rana Conway|Paul Elliott|Alicia Moag-Stahlberg|Akira Okayama|Nagako Okuda|Claire Robertson|Frankie Robinson|Sally F. Schakel|Mary Stevens|Nancy Van Heel|Liyan Zhao|BF Zhou
INTERMAP: the dietary data—process and quality control
University of North Carolina at Chapel Hill|Northwestern University|Virginia Commonwealth University Medical Center|Imperial College London|Imperial College London|Northwestern University|Shiga University of Medical Science|Iwate Medical University|Shiga University of Medical Science|Imperial College London|Imperial College London|University of Minnesota|University of Minnesota|University of Minnesota|Fu Wai Hospital|Chinese Academy of Medical Sciences & Peking Union Medical College|Fu Wai Hospital|Chinese Academy of Medical Sciences & Peking Union Medical College
aim report describe intermap standardized procedures assessing dietary intake 4680 individuals 17 population samples china japan uk usa based common protocol manuals operations standardized collection centrally trained certified staff four 24 h dietary recalls two timed 24h urines two 7day histories daily alcohol intake per participant tape recording dietary interviews use multiple methods ongoing quality control dietary data collection processing local national international one central laboratory urine analyses review update expansion available databases four countries produce comparable data 76 nutrients reported foods use databases international coordinating centres compute nutrient composition chinese participants reported 2257 foods japanese 2931 uk 3963 us use made 17 000 food items online automated nutrition data system average timerecall ranged 22 min china 31 min uk among indicators dietary data quality coding error rates recoding 10 random samples recalls 23 china 14 japan uk analogous us procedure reentry recalls computer tape recordings also yielded low discrepancy rates average scores assessment taped dietary interviews high 404 japan 453 china highest possible score 48 correlations urinary dietary nutrient valuessimilar men womenwere 4680 participants 051 total protein range across countries 040052 055 potassium range 030058 042 sodium range 033046 updated dietary databases valuable international resources dietary quality control procedures yielded data generally indicative high quality performance four countries procedures time consuming ongoing recoding random samples recalls deemed essential use tape recorded dietary interviews contributed quality control despite feasibility problems deemed remediable protocol modification quality assessment use correlation data dietary urinary nutrient values yielded meaningful findings including evidence special difficulties assessing sodium intake dietary methods