title: Relative validity of multiple telephone versus face-to-face 24-hour dietary recalls.
abstract: The relative validity of multiple telephone 24-hour dietary recalls was evaluated in a feasibility study within the framework of a large prospective investigation on the cause of chronic disease in women. Forty-nine women were interviewed four times both face-to-face and by telephone. Comparison of the total number of calories and intake of protein, carbohydrate, total and saturated fats, cholesterol, fiber, sodium, potassium, calcium, vitamin A, and vitamin C as estimated by multiple face-to-face and telephone interviews revealed an acceptable relative validity for the telephone procedure. Analysis of the position variation in the distribution (percent agreement) comparing the two procedures showed that a change in the distribution of none or one quintile occurs in more than 70% of individuals for all nutrients but vitamin C (69.4%), cholesterol (61.2%), and vitamin A (51.4%). Correlation coefficient analysis showed similar results. Adjustment for nutrient densities did not affect the overall results. Multiple 24-hour telephone dietary recalls appear to be a valid alternative to face-to-face interviews in population studies.
authors.affiliation: Institute of Internal Medicine and Metabolic Disease, 2nd Medical School, University of Naples, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Galasso
authors.forename: S
authors.initials: S
authors.lastname: Panico
authors.forename: E
authors.initials: E
authors.lastname: Celentano
authors.forename: M
authors.initials: M
authors.lastname: Del Pezzo
mesh_terms: D000328:Adult; D000368:Aged; D004034:Diet Surveys; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D007407:Interviews as Topic; D008875:Middle Aged; D015203:Reproducibility of Results; D013689:Telephone