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The percentage of mature height as a morphometric index of somatic growth: a formal scrutiny of conventional simple ratio scaling assumptions

Lolli, L, Johnson, A, Monaco, M, Di Salvo, VD, Atkinson, G and Gregson, W (2022) The percentage of mature height as a morphometric index of somatic growth: a formal scrutiny of conventional simple ratio scaling assumptions. Pediatric Exercise Science. pp. 1-9. ISSN 0899-8493

PES.2022-0077.R1_Proof_hi.pdf - Accepted Version

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Purpose: To assess conventional assumptions that underpin the percentage of mature height index as the simple ratio of screening height (numerator) divided by actual or predicted adult height (denominator). Methods: We examined cross-sectional data from 99 academy youth soccer players (chronological age range, 11.5 to 17.7 yr) skeletally immature at the screening time and with adult height measurements available at follow-up. Results: The y-intercept value of –60 cm (95% confidence interval [CI], –115 to –6 cm) from linear regression between screening height and adult height indicated the failure to meet zero y-intercept assumption. The correlation coefficient between present height and adult height of 0.64 (95%CI, 0.50 to 0.74) was not equal to the ratio of coefficient of variations between these variables (CVx/CVy = 0.46) suggesting Tanner’s special circumstance was violated. The non-zero correlation between the ratio and the denominator of 0.21 (95%CI, 0.01 to 0.39) indicated that the percentage of mature height was biased low for players with generally shorter adult height, and vice versa. Conclusion: For the first time, we have demonstrated that the percentage of mature height is an inconsistent statistic for determining the extent of completed growth, leading to potential biased inferences for research and applied purposes.

Item Type: Article
Additional Information: Accepted author manuscript version reprinted, by permission, from Pediatric Exercise Science, 2022, https://doi.org/10.1123/pes.2022-0077. © Human Kinetics, Inc.
Uncontrolled Keywords: 1106 Human Movement and Sports Sciences; 1114 Paediatrics and Reproductive Medicine; 1302 Curriculum and Pedagogy; Sport Sciences
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Human Kinetics
SWORD Depositor: A Symplectic
Date Deposited: 09 Aug 2022 10:50
Last Modified: 12 Oct 2022 09:37
DOI or Identification number: 10.1123/pes.2022-0077
URI: https://researchonline.ljmu.ac.uk/id/eprint/17359

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