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BMC Public Health
Published in: BMC Public Health 1/2010

Open Access 01-12-2010 | Research article

Validity of self-reported weight, height and resultant body mass index in Chinese adolescents and factors associated with errors in self-reports

Authors: Xiaoyan Zhou, Michael J Dibley, Yue Cheng, Xue Ouyang, Hong Yan

Published in: BMC Public Health | Issue 1/2010

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Abstract

Background

Validity of self-reported height and weight has not been adequately evaluated in diverse adolescent populations. In fact there are no reported validity studies conducted in Asian children and adolescents. This study aims to examine the accuracy of self-reported weight, height, and resultant BMI values in Chinese adolescents, and of the adolescents' subsequent classification into overweight categories.

Methods

Weight and height were self-reported and measured in 1761 adolescents aged 12-16 years in a cross-sectional survey in Xi'an city, China. BMI was calculated from both reported values and measured values. Bland-Altman plots with 95% limits of agreement, Pearson's correlation and Kappa statistics were calculated to assess the agreement.

Results

The 95% limits of agreement were -11.16 and 6.46 kg for weight, -4.73 and 7.45 cm for height, and -4.93 and 2.47 kg/m2 for BMI. Pearson correlation between measured and self-reported values was 0.912 for weight, 0.935 for height and 0.809 for BMI. Weighted Kappa was 0.859 for weight, 0.906 for height and 0.754 for BMI. Sensitivity for detecting overweight (includes obese) in adolescents was 56.1%, and specificity was 98.6%. Subjects' area of residence, age and BMI were significant factors associated with the errors in self-reporting weight, height and relative BMI.

Conclusions

Reported weight and height does not have an acceptable agreement with measured data. Therefore, we do not recommend the application of self-reported weight and height to screen for overweight adolescents in China. Alternatively, self-reported data could be considered for use, with caution, in surveillance systems and epidemiology studies.
Appendix
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Metadata
Title
Validity of self-reported weight, height and resultant body mass index in Chinese adolescents and factors associated with errors in self-reports
Authors
Xiaoyan Zhou
Michael J Dibley
Yue Cheng
Xue Ouyang
Hong Yan
Publication date
01-12-2010
Publisher
BioMed Central
Published in
BMC Public Health / Issue 1/2010
Electronic ISSN: 1471-2458
DOI
https://doi.org/10.1186/1471-2458-10-190

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