Modeling Growth Trajectories in Stunted Children Under 5 Years of Age: A Retrospective Analysis of Clinical Data from Guatemala

Abstract

Background

Stunting is a pervasive issue in low- and middle-income countries, particularly affecting rural and Indigenous populations. Little reported data is available on the growth of clinical populations of children with stunting, including those with more severe stunting.

Objective

This study examines growth trajectories of children under 5 years of age from a long-standing clinical care program to address childhood stunting that provides monthly at-home growth monitoring, family food rations, nutrition counseling, micronutrient supplementation, and childhood illness management.

Hypothesis

We hypothesized that children with stunting are a clinically heterogeneous group, where some experience ongoing growth failure and others catch-up growth.

Methods

We utilized data from 2827 children and 38 864 height measurements. We applied superimposition by translation and rotation modeling to characterize growth patterns.

Results

Median age at first measurement was 9 months (IQR: 3, 16) and median length of growth monitoring was 17 months (IQR: 8, 30). Median height-for-age Z-score at first measurement was −2.51 (IQR: −3.23, −1.68). There was variability in growth dynamics, with some children showing potential catch-up growth, particularly those with the lowest initial height-for-age metrics. In regression analysis, factors significantly associated with growth improvement over time included greater initial severity of stunting, male sex, and geographical region.

Conclusions

These findings underscore the heterogeneity of growth responses among stunted children and the need for individualized intervention strategies. They emphasize the necessity for ongoing investigations of both tailored clinical interventions and novel factors associated with growth variability and catch-up growth.

Plain Language Title

Understanding growth patterns of stunted children under 5 years of age in Guatemala: a chart review

Plain Language Summary

Why did we do the study?

Stunting is a widespread issue in less developed countries, especially in rural areas and among Indigenous people. Stunting, a condition in which individuals fail to reach their genetic height potential, is a marker of chronic malnutrition and is associated with hindered childhood development and immune system development and with chronic disease development later in life. Little reported data is available on the growth of clinical populations of children with stunting, including those with more severe stunting.

What did we do?

We examined the growth patterns of children under 5 years of age who participated in a nutrition program for stunting in rural Guatemala that provides monthly at-home growth monitoring, family food rations, nutrition counseling, vitamin and mineral supplementation, and childhood illness management.

What did we expect to find?

We thought that some of the children would show improvement in their height over time, while others would fail to make progress.

How did we do the study?

We used data from 2827 children that included multiple height measurements for each child. We used mathematical models to predict heights at different ages for individual children and for groups of children over time.

What did we find?

Most children were moderately stunted at first measurement. Different children showed different growth patterns. Some children improved, especially those who were the most behind to begin with. Also, males and children from certain regions of Guatemala improved more than other groups.

What do the findings mean?

These findings show that there is significant variability in response to treatment among children with stunting and that individualized treatment strategies are needed. They emphasize the importance of ongoing research into nutrition initiatives that are appropriately adapted to local needs and of research into emerging areas of study related to growth variability.