Within- and between-person variation in dietary surveys: number of days needed to classify individuals
1986
Marr, J.W. | Heady, J.A.
A weighed food study assessed variations in energy and nutrient intakes among and within 332 men in several different population groups, viz.: 2 groups of executive civil servants (151 men; ages, 40-49) working in London in 1970-71; and 171 drivers and conductors (ages, 30-67) of London double-decker buses during 1958-67. The results indicated that the number of days required for classifying the men with 80% confidence varied from 2-3 days for some nutrients (sugar, total carbohydrates) to 2-3 weeks for other dietary substances (cholesterol, polyunsaturated/saturated fatty acid ratio). The relevance of these findings to standard 24-hour surveys of nutrient intake is discussed.(wz)
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