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Conclusions about differences in linear growth between Bangladeshi boys and girls depend on the growth reference used

Abstract

Objective: To examine sex differences in height-for-age z-scores and the percentage stunting among Bangladeshi children estimated using three growth references.

Design, setting and subjects: Data collected between 1990 and 1999 by Helen Keller International's nutritional surveillance system in rural Bangladesh were analyzed for 504 358 children aged 6–59 months. Height-for-age z-scores were estimated using the 1977 NCHS, 2000 CDC and 1990 British growth references.

Results: The shape of the growth curves for Bangladeshi boys and girls, and their positions relative to one another, depend on which of the three growth references is used. At 6 months of age the British reference showed no sex difference whereas the NCHS and CDC showed girls to have higher average z-scores than boys by 0.14 and 0.28 s.d., respectively. While all references showed a faster deterioration of girls’ z-scores from 6 to 24 months, the magnitude and direction of the sex differences, and how they changed with age, were different. There was greater disagreement about girls’ z-scores than boys. Discontinuities at 24 months in the NCHS and CDC produced jagged curves whereas the British curves were smooth.

Conclusions: The assessment of sex differences in linear growth depends on the growth reference used. Reasons for the different results need to be determined and may aid the final development of the new WHO international growth reference and the guidelines for its use. The findings suggest that anthropometry as a tool to explore the effects of societal gender inequality must be used with caution.

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Acknowledgements

This publication was made possible through support provided by the United States Agency for International Development Mission to Bangladesh under the terms of the Co-operative Agreement No. 388-A-00-99-00060-00. The opinions expressed herein are those of the authors and do not necessarily reflect the views of USAID. We thank Mamunur Rashid and Shamim Ahmed of the IPHN for their collaboration, our collaborating NGOs, all the field staff led by Abdul Hye, Mojibur Rahman Hawlader and Abdul Quddus Mondal for their diligent work, and the families who generously gave their time to participate in the data collection.

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Guarantor: MW Bloem.

Contributors: A Hye has been the manager of the Nutritional Surveillance Project (NSP) throughout the period of data collection for the present study and was, therefore, responsible for the quality of the data analyzed for this paper. NH was the policy advisor and gender specialist. HM was responsible for the analysis of the data together with NS and MZI. The writing of the paper was done by HM with assistance from SdeP, A Hall and MWB, and with the approval of the other authors.

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Correspondence to H Moestue.

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Moestue, H., de Pee, S., Hall, A. et al. Conclusions about differences in linear growth between Bangladeshi boys and girls depend on the growth reference used. Eur J Clin Nutr 58, 725–731 (2004). https://doi.org/10.1038/sj.ejcn.1601870

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