Validation of protein intake assessed from weighed dietary records against protein estimated from 24 h urine samples in children, adolescents and young adults participating in the Dortmund Nutritional and Longitudinally Designed (DONALD) Study

Bokhof B, Guenther ALB, Berg-Beckhoff G, Kroke A, Buyken AE (2010)
PUBLIC HEALTH NUTRITION 13(06): 826-834.

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Abstract
Objective. To date, only a few nutritional assessment methods have been validated against the biomarker of urinary-N excretion for use in children and adolescents. The aim of the present study was to validate protein intake from one day of a weighed dietary record against protein intake estimated from a simultaneously collected 24 h urine sample. Design: Cross-sectional analyses including 439 participants of the Dortmund Nutritional and Longitudinally Designed (DONALD) Study from four age groups (3-4, 7-8, 11-13 and 18-23 years). Mean differences, Pearson correlation coefficients (r), cross-classifications and Bland-Altman plots were used to assess agreement between methods. Results: Weighed dietary records significantly underestimated mean protein intake by -6.4 (95% CI -8.2, -4.7) g/d or -11%, with the difference increasing across the age groups from -0.6(95% CI -2.7, 1.5) g/d at age 3-4 years to -135(95% CI -18.7, -8.3)g/d at age 18-23 years. Correlation coefficients were r=0.7 for the total study sample and ranged from r=0.5 to 0.6 in the different age groups. Both methods classified 85% into the same/adjacent quartile for the whole study group (83-86% for the different age groups) and 2.5% into the opposite quartile (1.9-3.1% for the different age groups). Bland-Altman plots for the total sample indicated that differences in protein intake increased across the range of protein intake, while this bias was not obvious within the age groups. Conclusions: Protein intake in children and adolescents can be estimated with acceptable validity by weighed dietary records. In this age-heterogeneous sample, validity was lower among adolescents and young adults.
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Bokhof B, Guenther ALB, Berg-Beckhoff G, Kroke A, Buyken AE. Validation of protein intake assessed from weighed dietary records against protein estimated from 24 h urine samples in children, adolescents and young adults participating in the Dortmund Nutritional and Longitudinally Designed (DONALD) Study. PUBLIC HEALTH NUTRITION. 2010;13(06):826-834.
Bokhof, B., Guenther, A. L. B., Berg-Beckhoff, G., Kroke, A., & Buyken, A. E. (2010). Validation of protein intake assessed from weighed dietary records against protein estimated from 24 h urine samples in children, adolescents and young adults participating in the Dortmund Nutritional and Longitudinally Designed (DONALD) Study. PUBLIC HEALTH NUTRITION, 13(06), 826-834.
Bokhof, B., Guenther, A. L. B., Berg-Beckhoff, G., Kroke, A., and Buyken, A. E. (2010). Validation of protein intake assessed from weighed dietary records against protein estimated from 24 h urine samples in children, adolescents and young adults participating in the Dortmund Nutritional and Longitudinally Designed (DONALD) Study. PUBLIC HEALTH NUTRITION 13, 826-834.
Bokhof, B., et al., 2010. Validation of protein intake assessed from weighed dietary records against protein estimated from 24 h urine samples in children, adolescents and young adults participating in the Dortmund Nutritional and Longitudinally Designed (DONALD) Study. PUBLIC HEALTH NUTRITION, 13(06), p 826-834.
B. Bokhof, et al., “Validation of protein intake assessed from weighed dietary records against protein estimated from 24 h urine samples in children, adolescents and young adults participating in the Dortmund Nutritional and Longitudinally Designed (DONALD) Study”, PUBLIC HEALTH NUTRITION, vol. 13, 2010, pp. 826-834.
Bokhof, B., Guenther, A.L.B., Berg-Beckhoff, G., Kroke, A., Buyken, A.E.: Validation of protein intake assessed from weighed dietary records against protein estimated from 24 h urine samples in children, adolescents and young adults participating in the Dortmund Nutritional and Longitudinally Designed (DONALD) Study. PUBLIC HEALTH NUTRITION. 13, 826-834 (2010).
Bokhof, Beate, Guenther, Anke L. B., Berg-Beckhoff, Gabriele, Kroke, Anja, and Buyken, Anette E. “Validation of protein intake assessed from weighed dietary records against protein estimated from 24 h urine samples in children, adolescents and young adults participating in the Dortmund Nutritional and Longitudinally Designed (DONALD) Study”. PUBLIC HEALTH NUTRITION 13.06 (2010): 826-834.
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