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Estimation of annual height velocity based on short- versus long-term measurements
1Department of Pediatrics, Istanbul Faculty of Medicine, University of Istanbul, Capa.
Insights
Accurate annual height velocity assessment in children requires 12-month intervals. Six-month measurements can be misleading due to seasonal variations, while 12-month intervals provide reliable growth data.
Area of Science:
- Pediatric Endocrinology
- Human Growth and Development
Background:
- Accurate assessment of annual height velocity is crucial for monitoring child growth.
- Previous studies have utilized varying measurement intervals, leading to potential discrepancies.
Purpose of the Study:
- To evaluate the reliability of annual height velocity calculations based on different measurement intervals (6, 12, and 24 months).
- To determine the optimal measurement frequency for accurate annual height velocity estimation in prepubertal children.
Main Methods:
- Longitudinal study involving 69 healthy prepubertal children (aged 6.5 years).
- Biannual height measurements were taken over 2.5 years.
- Annual height velocity was calculated using 6, 12, and 24-month intervals between measurements.
Main Results:
- Significant variability was observed in consecutive six-monthly height velocity measurements.
- Six-monthly velocity data did not reliably predict annual velocities calculated from 12- or 24-month intervals.
- Height velocity calculated at 12-month intervals closely approximated values derived from 24-month intervals.
Conclusions:
- Six-month measurement intervals for height velocity in children can be misleading.
- Twelve-month measurement intervals are as reliable as 24-month intervals for estimating annual height velocity.
- Annual growth monitoring should preferably utilize 12-month measurement intervals for accuracy.
Abstract:
We assessed the relationships between annual height velocity, calculated from two measurements taken at intervals of 6, 12 and 24 months, in 69 healthy prepubertal children (34 male, 35 female) aged 6.5 years (range 6.25-6.75 yrs) who were followed for 2.5 years and measured biannually. Initial height values for age were within normal ranges except for one child with a height SDS of -2.0. Mean annual velocities also conformed to British norms. Significant differences were observed between consecutive six-monthly velocities and these values failed to predict annual velocities calculated from measurements taken at 12- or 24-month intervals. Seasonal effects were thought to have some impact on the six-monthly velocity differences. Height velocity, based on measurements taken at intervals of 12 months, was essentially similar to two-year velocity values. The results indicate that in estimating annual height velocity, six-month intervals between measurements may be misleading while 12-monthly measurements are as reliable as height velocity values based on measurements taken at two-year intervals.