Sherar et al developed a model for predicting the adult height of an older child or adolescent. This is based on height velocity curves. The authors are from the University of Saskatchewan in Canada and Katholieke Universiteit Leuven in Belgium.
Parameters:
(1) age of the patient in years (to 2 decimal points)
(2) gender of the patient
(3) standing height in cm
(4) sitting height in cm
(5) weight in kilograms
leg length in cm =
= (standing height in cm) - (sitting height in cm)
leg length and sitting height interaction =
= (leg length in cm) * (sitting height in cm)
age and leg length interaction =
= (age in years) * (leg length in cm)
age and sitting height interaction =
= (age in years) * (sitting height in cm)
weight by height ratio =
= (weight in kilograms)/ (standing height in cm) * 100
maturity offset in years = number of years from peak height velocity =
= (0.0002708 * (leg length and sitting height interaction)) - (0.001663 * (age and leg length interaction)) + (0.007216 * (age and sitting height interaction)) + (0.02292 * (weight by height ratio)) - 9.236
age at peak heat velocity =
= (current age in years) - (maturity offset)
The age at peak height velocity determines if the person is an early, average or late maturer.
|
Age at Peak Height Velocity |
Boy |
Girl |
|
early maturer |
< 13 years |
< 10.8 years |
|
average maturer |
13 - 14.65 years |
10.8 - 12.35 years |
|
late maturer |
> 14.65 years |
> 12.35 years |
derived from data in Table I, page 510
final adult height in =
= (current standing height in cm) + (growth left based on years from peak height velocity)
Table II on page 511 plots (1) years from peak height velocity = maturity offset, (2) gender, and (3) type of maturer to return the growth left in centimeters.
If the data is analyzed in Minitab:
Male, early maturer , maturity offset -4.0 to -0.2
centimeters =
= (-0.1511 * ((offset)^3)) - (1.272 * ((offset)^2)) - (9.16 * (offset)) + 19.49
Male, early maturer, maturity offset -0.2 to +4.0
centimeters =
= (-0.1680 * ((offset)^3)) + (2.313 * ((offset)^2)) - (11.30 * (offset)) + 18.95
Male, average maturer , maturity offset -4.0 to -0.2
centimeters =
= (-0.2016 * ((offset)^3)) - (1.668 * ((offset)^2)) - (9.405 * (offset)) + 16.37
Male, average maturer, maturity offset -0.2 to +4.0
centimeters =
= (-0.1757 * ((offset)^3)) + (2.293 * ((offset)^2)) - (10.37 * (offset)) + 16.08
Male, late maturer , maturity offset -4.0 to -0.2
centimeters =
= (-0.1291 * ((offset)^3)) - (1.219 * ((offset)^2)) - (8.203 * (offset)) + 13.17
Male, late maturer, maturity offset -0.2 to +4.0
centimeters =
= (-0.1249 * ((offset)^3)) + (2.029 * ((offset)^2)) - (9.328 * (offset)) + 13.03
Female, early maturer, maturity offset -4.0 to +0.2
centimeters =
= (-0.1848 * ((offset)^3)) - (1.439 * ((offset)^2)) - (8.981 * (offset)) + 18.03
Female, early maturer, maturity offset +0.2 to +4.0
centimeters =
= (-0.141 * ((offset)^3)) + (2.012 * ((offset)^2)) - (10.32 * (offset)) + 18.11
Female, average maturer , maturity offset -4.0 to +0.2
centimeters =
= (-0.0819 * ((offset)^3)) - (0.6945 * ((offset)^2)) - (7.485 * (offset)) + 14.78
Female, average maturer, maturity offset +0.2 to +4.0
centimeters =
= (-0.1639 * ((offset)^3)) + (2.101 * ((offset)^2)) - (9.542 * (offset)) + 15.05
Female, late maturer , maturity offset -4.0 to +0.2
centimeters =
= (-0.12241 * ((offset)^3)) - (0.9486 * ((offset)^2)) - (7.586 * (offset)) + 11.44
Female, late maturer, maturity offset +0.2 to +4.0
centimeters =
= (-0.1951 * ((offset)^3)) + (2.134 * ((offset)^2)) - (8.268 * (offset)) + 11.41
