Intraobserver error associated with anthropometric measurements made by dietitians.

Laura Ansotegui · Ana María Rocandio

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Reliability and Agreement in Measurement Dietetics, Nutrition, and Education Body Composition Measurement Techniques

Abstract

INTRODUCTION: Although dietitians play an important role in the anthropometric assessment, reports on measurements made by these health professionals rarely include estimates of measurement error. AIM: To estimate of intraobserver precision for three common anthropometric measurements made by dietitians. METHODS: Twenty six measurers performed measurements (upper mid-arm circumference, tricipital and bicipital skinfold) in two times a sample of ten volunteers. Four precision estimates were calculated: the technical error of measurement (TEM), the relative technical error of measurement (rTEM), the coefficient of reliability (R) and the coefficient of variation (CV). RESULTS: For skinfold thickness, rTEM was smaller than 2.2; for circumference, rTEM was smaller than 0.6. The precision to measure skinfolds was lower than the precision to circumference. Anyway, for all measurements R showed a high degree of precision (R > 95). CONCLUSION: Our results suggest that anthropometric parameters evaluated are sufficiently precise. However, periodical training is necessary to control and minimize the anthropometric measurement error.

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References

1988INTERVAL ESTIMATES FOR CORRELATION COEFFICIENTS CORRECTED FOR WITHIN-PERSON VARIATION: IMPLICATIONS FOR STUDY DESIGN AND HYPOTHESIS TESTING 2003Harmonization of anthropometric measurements for a multicenter nutrition survey in Spanish adolescents 1989THE SECOND NATIONAL HEALTH AND NUTRITION EXAMINATION SURVEY 1976%1980 1994Intra- and inter-observer error in anthropometric measurement

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