The authors report the results of a dietary survey of 38,121 Iowa women, 55-69 years of age in 1986, based on a semiquantitative food frequency questionnaire previously tested among Boston-area women aged 34-59 years. The Iowa women, compared with the younger Boston-area women, consumed a similar amount of calories (1,767 vs. 1,844 kcal) and a similar amount of total calories from fat (35 vs. 37%) but had markedly greater intake of the following mtaronutrients after including supplement use: iron (+18%), calcium (+33%), vitamin A (+43%), riboflavin (+46%), thiamine (+50%), and pyridoxine (+122%). The reproducibility of the questionnaire was examined in two more administrations to 44 of the Iowa women in January and June of 1988. Reproducibirity was highest for alcohol (Pearson's r = 0.99), caffeine (r = 0.95), and vitamin E (r = 0.90) and lowest for sucrose (r = 0.53), polyunsaturated fat (r = 0.56), and iron (r = 0.59). Micronutrient intakes were generally more reproducible than macronutrient intakes. The agreement between the June 1988 questionnaire and the average of five 24-hour dietary recalls was also assessed in the 44 subjects. The median correlations of energy-adjusted intake were as follows: for macronutrients, r = 0.45; for micronutrients without supplements, r = 0.33; and for micronutrients with supplements, r = 0.64. This food frequency questionnaire appears to be reasonably reproducible and accurate, so that Its use may be extended to epidemiokxjic studies of older women with a broad range of socioeconomic backgrounds. Am J Epidemiol 1992:136:192-200.
|Original language||English (US)|
|Number of pages||9|
|Journal||American journal of epidemiology|
|State||Published - Jul 15 1992|
Bibliographical noteFunding Information:
Received for publication April 9, 1991, and in final form January 8, 1992. ' Department of Preventive Medicine and Environmental Health, University of Iowa Coflege of Medicine, Iowa City, IA. 'Division of Epidemiology, University of Minnesota School of Public Health, Minneapolis, MN. 3 Division of Human Development and Nutrition, University of Minnesota School of Public Health, Minneapolis, MN. Reprint requests to Dr. Ronald G. Munger, Department of Preventive Medicine and Environmental Health, 2830 Stemdler Building, University of Iowa College of Medicine, Iowa City, IA 52242. Supported by grant R01-CA 39742 from the National Cancer Institute. The authors gratefully acknowledge the assistance of Ray Hsieh, Cyndy Long, Dr. Laura Sampson, Dr. Mary Fran Sowers, Dr. Robert Wallace, Joyce Wenz, and Dr Walter Wlett.
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- Nutrition surveys