Maturity-based correction mechanism for talent identification: When is it needed, does it work, and does it help to better predict who will make it to the pros?

Table 2. Maturity indicators and calculation procedures.

Indicator	Calculation procedure	Reference
Mirwald	Maturity offset = –9.236 + (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)	Mirwald et al. (2002)
Moore-1	Maturity offset = –8.125741 + (0.0070346 · age · sitting height)	Moore et al. (2015)
Moore-2	Maturity offset = –7.999994 + (0.0036124 · age · height)	Moore et al. (2015)
Fransen-1	Maturity ratio = 6.986547255416 + (0.115802846632 · age) + (0.001450825199 · age²) + (0.004518400406 · weight) – (0.000034086447 · weight²) – (0.151951447289 · height) + (0.000932836659 · height²) – (0.000001656585 · height³) + (0.032198263733 · leg length) – (0.000269025264 · leg length²) – (0.000760897942 · height · age)	Fransen et al. (2018b)
Fransen-2	Maturity ratio = 6.99 + (0.154 · age – 0.242) + (0.00452 · weight) – (0.0000341 · weight²) – (0.152 · height) + (0.000933 · height²) – (0.00000166 · height³) + (0.0322 · leg length) – (0.000269 · leg length²) – (0.000761 · height · age)	Fransen et al. (2018a)
%PAH	%PAH = (height at the age of 15 · 100) / predicted adult height according to the method of Sherar et al. (2005)	Sherar et al. (2005)
%RAH	%RAH = (height at the age of 15 · 100) / real adult height at the age of 21	Baxter-Jones et al. (2005)

%PAH = attained percentage of predicted adult height; %RAH = attained percentage of the real adult height. Measurement units: centimeters (leg length, sitting height, height), kilograms (weight), and years (age).