Salter, Jamie ORCID: https://orcid.org/0000-0002-7375-1476 and Towlson, Chris (2026) The importance of equation selection for the accuracy of maturity offset data. Journal of Science and Medicine in Sport. (In Press)

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Abstract

Objective & Design
Using a paired-samples t-test and Cohen's d effect sizes, this brief report compared two maturity offset (MO) equations, the widely cited but incorrectly printed Mirwald et al. (2002) equation and the corrected Malina and Koziel (2014) equation using anthropometric data from 952 youth athletes.
Results
Results revealed significant (p < 0.001), extremely large differences in predicted age of peak height velocity (APHV). Mirwald et al. predicted APHV by to be higher than the corrected method by 0.71 years in males (N = 668) and 2.45 years in females (N = 264).
Conclusions
These systematic discrepancies suggest that using the uncorrected Mirwald equation likely leads to inaccurate maturity estimation. Practitioners should adopt corrected equations to ensure effective maturity-specific interventions in long-term athletic development and injury prevention.

Item Type:	Article
Status:	In Press
DOI:	10.1016/j.jsams.2026.10.015
School/Department:	School of Health Sciences
URI:	https://ray.yorksj.ac.uk/id/eprint/16233

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