title: Adult recall of adolescent diet: reproducibility and comparison with maternal reporting.
abstract: Many cancers have long latency periods, and dietary factors in adolescence may plausibly affect cancer occurrence in adulthood. Because of a lack of prospective data, retrospective collection of data on adolescent diet is essential. The authors evaluated a 124-item high school food frequency questionnaire (HS-FFQ) assessing diet during high school (15-35 years in the past) that was completed in 1998 by 45,947 US women in the Nurses' Health Study II (NHSII) cohort. To assess reproducibility, the authors readministered the HS-FFQ approximately 4 years later to 333 of these women. The mean Pearson correlation for 38 nutrient intakes was 0.65 (range, 0.50-0.77), and the mean Spearman rank correlation for food intakes was 0.60 (range, 0.37-0.77). Current adult diet was only weakly correlated with recalled adolescent diet (for nutrient intakes, mean r = 0.20). For assessment of validity, 272 mothers of the NHSII participants were asked to report information on their daughters' adolescent diets using the HS-FFQ. In this comparison, the mean Pearson correlation was 0.40 (range, 0.13-0.59) for nutrients, and the mean Spearman rank correlation for foods was 0.30 (range, 0.10-0.61). While further studies are warranted, these findings imply that this food frequency questionnaire provides a reasonable record of adolescent diet.
authors.affiliation: Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston 02215, MA, USA. nhssm@channing.harvard.edu
authors.forename: Sonia S
authors.initials: SS
authors.lastname: Maruti
authors.forename: Diane
authors.initials: D
authors.lastname: Feskanich
authors.forename: Graham A
authors.initials: GA
authors.lastname: Colditz
authors.forename: A Lindsay
authors.initials: AL
authors.lastname: Frazier
authors.forename: Laura A
authors.initials: LA
authors.lastname: Sampson
authors.forename: Karin B
authors.initials: KB
authors.lastname: Michels
authors.forename: David J
authors.initials: DJ
authors.lastname: Hunter
authors.forename: Donna
authors.initials: D
authors.lastname: Spiegelman
authors.forename: Walter C
authors.initials: WC
authors.lastname: Willett
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004032:Diet; D005260:Female; D006801:Humans; D011939:Mental Recall; D008875:Middle Aged; D009035:Mothers / Q000523:psychology*; D011446:Prospective Studies; D015203:Reproducibility of Results; D018709:Statistics, Nonparametric; D011795:Surveys and Questionnaires