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Predictive value of short-term growth using knemometry in a large population of healthy children
H J Dean1, C T Schentag, J S Winter
1Department of Pediatrics, University of Manitoba, Winnipeg, Canada.
Insights
Childhood growth is variable. Knemometry (lower leg measurement) and stadiometry (height measurement) over one year showed inconsistent monthly growth, limiting long-term prediction accuracy.
Area of Science:
- Pediatrics
- Human Growth and Development
- Biometry
Background:
- Accurate measurement of child growth is crucial for monitoring health and development.
- Knemometry offers a potential method for assessing lower leg growth, but its long-term predictive value is not fully established.
- Understanding growth variability is essential for interpreting measurements.
Purpose of the Study:
- To analyze the variability of lower leg growth and height growth in children over one year.
- To determine the correlation between short-term and long-term growth measurements.
- To assess the predictive value of knemometry for long-term growth in children.
Main Methods:
- Longitudinal study of 90 healthy children aged 3-16 years over one year.
- Monthly measurements of lower leg length using a knemometer.
- Monthly measurements of height using a stadiometer.
Main Results:
- Significant intra- and inter-individual variability in monthly lower leg growth (up to 4-fold) was observed, independent of age or sex.
- Correlation between short-term and annual growth rates increased with longer observation periods.
- A 6-month observation interval showed the highest predictive value for annual lower leg growth (R² = 0.727) and annual height growth (R² = 0.732).
Conclusions:
- Variable growth rates in different skeletal parts and over time limit the utility of knemometry for predicting long-term growth.
- While 6-month measurements offer good prediction, month-to-month consistency in growth patterns is lacking.
- Knemometry's predictive accuracy for long-term growth is constrained by inherent biological variability.
Abstract:
We have analyzed the lower leg growth using a knemometer and the height growth using a stadiometer of 90 healthy children aged 3-16 years, for one year. The intra- and inter-individual monthly lower leg growth varied up to 4-fold, which was not accounted for by age or sex. The correlation between short term and annual lower leg growth rates increased with longer observation periods. There was no month-to-month consistency in the ratio of lower leg growth and height growth. There was no correlation between 1 month lower leg growth and annual height growth. The correlation increased with time. The 6-month observation interval was the interval with the highest predictive value for annual lower leg growth (R2 = 0.727) and annual height growth (R2 = 0.732). We conclude that growth of different parts of the skeleton and variable interval growth rates limits the ability of knemometry to predict long term growth.