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Nutrition and Health (including climate and ecological aspects)

Reference cut-offs to define low serum zinc concentrations in healthy 1–19 year old Indian children and adolescents

A Correction to this article was published on 06 April 2022

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Abstract

Background/Objectives

Population zinc (Zn) status assessment is based on serum zinc concentration (SZC) cut-offs defined by the International Zinc Nutrition Consultative Group (IZiNCG). The objective of this study is to derive reference SZC cut-offs in apparently healthy 1-19 year Indian children and adolescents using comprehensive national nutrition survey (CNNS) data, and to measure the prevalence of Zn deficiency.

Subjects/Methods

Apparently healthy children (n = 12,473) were selected from the CNNS, by including the highest 2 wealth quintiles, and excluding stunted, thin and obese children, and those with CRP > 5 mg/L, anaemia, hypo-albuminemia, diabetes, recent diarrhoea and history of smoking. The 2.5th centile of age-based distributions defined the SZC cut-offs, used to measure the prevalence of Zn deficiency in India, as against the IZiNCG cut-offs.

Results

The present study SZC cut-offs were significantly lower, by 10–18 µg/dL, than the IZiNCG cut-offs; more in adolescents. Prevalence of Zn deficiency in the entire CNNS, with these cut-offs, was 2.7 (<10 years) to 5.5 (10-19 years) times lower than with the IZiNCG cut-offs. No geographical state, nor any age group, had Zn deficiency as a serious public health problem (≥20%). In contrast, with IZiNCG cut-offs, 9-27 states (depending on age group) had a public health problem.

Conclusions

The present study reference SZC cut-offs for Zn deficiency are lower than the IZiNCG cut-offs, and their rigorous selection from a national sample makes them more appropriate for use in India. A re-examination of the global applicability of IZiNCG recommended cut-offs in other LMICs appears appropriate.

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Fig. 1: Flowchart of participant exclusion.
Fig. 2: The distribution of serum zinc concentrations (µg/dL) stratified by age, gender and fasting status.
Fig. 3: Comparison of 2.5th centile serum zinc concentrations from the primary analytic sample with existing IZiNCG cut-offs.
Fig. 4: Weighted mean (95% CI) prevalence of low SZC in Indian children and adolescent with study cut-offs (2.5th centile) and IZiNCG cut-off.

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Data availability

The Ministry of Health and Family Welfare (MoHFW), Government of India, owns the CNNS data.

Change history

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Acknowledgements

HSS and AVK are recipients of the Wellcome Trust/Department of Biotechnology India Alliance Clinical/Public Health Research Centre Grant # IA/CRC/19/1/610006. RP, BK, GBR, and HR are supported by the Indian Council of Medical Research, Govt of India.

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Authors and Affiliations

Authors

Contributions

HSS, AVK, SG, and RP conceptualized the manuscript, and RP wrote the first draft and revised under the supervision of HSS and AVK. SG led the statistical analysis with guidance from HSS and AVK. HSS, AVK, RP, SG, BK, GBR and HR contributed to the data interpretation and had access to all the data. All authors reviewed and approved the submitted manuscript. HSS and AVK had final responsibility for the decision to submit for publication.

Corresponding authors

Correspondence to Anura V. Kurpad or Harshpal S. Sachdev.

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Competing interests

HSS designed the draft protocol of the CNNS with consultancy support from UNICEF, India. HSS, UK, and AVK were members of the Technical Advisory Committee of the CNNS, constituted by the Ministry of Health and Family Welfare of the Government of India, to oversee its conduct and analysis. HSS is a member of the WHO Nutrition Guidance Expert Advisory Subgroup on Diet and Health and Guideline Development Group on the use and interpretation of haemoglobin concentrations for assessing anaemia status in individuals and populations, member of the World Health Organization Nutrition Guidance Expert Advisory Subgroup on Diet and Health and Expert group on nutrient requirements: setting calcium, vitamin D and Zn nutrient intake values for children aged 0-4 years. He is also member of Expert Groups of the Ministry of Health and Family Welfare on Nutrition and Child Health. SD was involved in the CNNS study implementation. There were no other conflicts to declare. The views expressed here by the authors are in their individual capacity and should not be construed as views or recommendations of the institutions the authors belong to.

Ethical approval

The CNNS was conducted after obtaining due International Ethical approval from the Population Council’s International Review Board, New York, USA and National Ethical approval from Post Graduate Institute of Medical Education and Research, Chandigarh, India (Ref. 14).

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Pullakhandam, R., Ghosh, S., Kulkarni, B. et al. Reference cut-offs to define low serum zinc concentrations in healthy 1–19 year old Indian children and adolescents. Eur J Clin Nutr 76, 1150–1157 (2022). https://doi.org/10.1038/s41430-022-01088-4

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