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- Title
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.
- Authors
Bokhof, Beate; Günther, Anke L. B.; Berg-Beckhoff, Gabriele; Kroke, Anja; Buyken, Anette E.
- 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 26·4 (95% CI 28·2, 24·7) g/d or -11 %, with the difference increasing across the age groups from 20·6 (95% CI 22·7, 1·5) g/d at age 3-4 years to -13·5 (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.
- Subjects
AGE distribution; WEIGHT measurement; NUTRITIONAL assessment; INGESTION disorders in children; INGESTION; AGE groups
- Publication
Public Health Nutrition, 2010, Vol 13, Issue 6, p826
- ISSN
1368-9800
- Publication type
Article
- DOI
10.1017/S136898000999317X