title: Calibration of the dietary questionnaire for a multiethnic cohort in Hawaii and Los Angeles.
abstract: The performance of the dietary questionnaire used in a multiethnic cohort study in Hawaii and Los Angeles was assessed in a calibration substudy that compared diet reported from the questionnaire with three 24-hour dietary recalls. For the calibration substudy, subjects from each of eight subgroups defined by sex and ethnic group (African-American, Japanese-American, Latino, and White) were chosen randomly from among the cohort members, and each participant's previous day's diet was assessed by telephone recall on three occasions over approximately 2 months. After completing the three 24-hour recalls, each calibration subject was sent a second questionnaire; 1,606 persons completed three recalls and a second questionnaire (127 to 267 per ethnic-sex group). This report describes correlation coefficients and calibration slopes for the relation between the 24-hour recalls and second questionnaire values for a selected set of macro- and micronutrients, as absolute intakes, nutrient densities, and calorie-adjusted nutrients. In all subgroups, estimates of the correlation between the questionnaire and 24-hour recalls were greater after energy adjustment (average correlations ranged from 0.57-0.74 for nutrient densities and from 0.55-0.74 for calorie-adjusted nutrients) than when absolute nutrient values were used (average range 0.26-0.57). For absolute nutrient intakes, the correlations were greatest for Whites, somewhat lower for Japanese-Americans and Latinos, and lowest for African-Americans. After energy adjustment, the difference between subgroups were diminished, and the correlations were generally highly satisfactory.
authors.affiliation: Department of Preventive Medicine, School of Medicine, University of Southern California, Los Angeles 90033-9987, USA.
authors.forename: D O
authors.initials: DO
authors.lastname: Stram
authors.forename: J H
authors.initials: JH
authors.lastname: Hankin
authors.forename: L R
authors.initials: LR
authors.lastname: Wilkens
authors.forename: M C
authors.initials: MC
authors.lastname: Pike
authors.forename: K R
authors.initials: KR
authors.lastname: Monroe
authors.forename: S
authors.initials: S
authors.lastname: Park
authors.forename: B E
authors.initials: BE
authors.lastname: Henderson
authors.forename: A M
authors.initials: AM
authors.lastname: Nomura
authors.forename: M E
authors.initials: ME
authors.lastname: Earle
authors.forename: F S
authors.initials: FS
authors.lastname: Nagamine
authors.forename: L N
authors.initials: LN
authors.lastname: Kolonel
mesh_terms: D001741:Black or African American / Q000706:statistics & numerical data; D000368:Aged; D001213:Asian / Q000706:statistics & numerical data; D002138:Calibration; D015331:Cohort Studies; D004032:Diet; D004034:Diet Surveys; D004812:Epidemiologic Methods; D005006:Ethnicity / Q000706:statistics & numerical data*; D005260:Female; D006254:Hawaii / Q000453:epidemiology; D006630:Hispanic or Latino / Q000706:statistics & numerical data; D006801:Humans; D015141:Los Angeles / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000208:ethnology*; D011795:Surveys and Questionnaires / Q000592:standards*; D044465:White People / Q000706:statistics & numerical data