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Height-for-Age Z Scores Increase despite Increasing Height Deficits among Children in 5 Developing Countries

Citation

Lundeen, Elizabeth A.; Stein, Aryeh D.; Adair, Linda S.; Behrman, Jere R.; Bhargava, Santosh K.; Dearden, Kirk A.; Gigante, Denise; Norris, Shane A.; Richter, Linda M.; & Fall, Caroline H. D., et al. (2014). Height-for-Age Z Scores Increase despite Increasing Height Deficits among Children in 5 Developing Countries. American Journal of Clinical Nutrition, 100(3), 821-825. PMCID: PMC4135493

Abstract

Background: Growth failure remains a persistent challenge in many countries, and understanding child growth patterns is critical to the development of appropriate interventions and their evaluation. The interpretation of changes in mean height-for-age z scores (HAZs) over time to define catch-up growth has been a subject of debate. Most studies of child growth have been cross-sectional or have focused on children through age 5 y. Objective: The aim was to characterize patterns of linear growth among individuals followed from birth into adulthood. Design: We compared HAZs and difference in height (cm) from the WHO reference median at birth, 12 mo, 24 mo, mid-childhood, and adulthood for 5287 individuals from birth cohorts in Brazil, Guatemala, India, the Philippines, and South Africa. Results: Mean HAZs were <0 at birth in the 3 cohorts with data and ranged from -0.6 (Brazil) to -2.9 (Guatemala) at age 24 mo. Between 24 mo and mid-childhood, HAZ values increased by 0.3-0.5 in South Africa, Guatemala, and the Philippines and were unchanged in Brazil and India. Between mid-childhood and adulthood, mean HAZs increased in all cohorts but remained <0 in adulthood [mean range: -0.3 (Brazil) to -1.8 (Guatemala and Philippines)]. However, from 24 mo to adulthood, height differences from the reference median became greater. Conclusions: From age 2 y to adulthood, mean HAZs increased, even though height deficits relative to the reference median also increased. These 2 metrics may result in different interpretations of the potential for and the impact of catch-up growth in height.

URL

http://dx.doi.org/10.3945/ajcn.114.084368

Reference Type

Journal Article

Year Published

2014

Journal Title

American Journal of Clinical Nutrition

Author(s)

Lundeen, Elizabeth A.
Stein, Aryeh D.
Adair, Linda S.
Behrman, Jere R.
Bhargava, Santosh K.
Dearden, Kirk A.
Gigante, Denise
Norris, Shane A.
Richter, Linda M.
Fall, Caroline H. D.
Martorell, Reynaldo
Sachdev, Harshpal Singh
Victora, Cesar G., on behalf of the COHORTS Investigators

PMCID

PMC4135493