Response to “A Note on “Response to: Methodological Rigor in Reference Chart Development: A Comment on ‘Normative Reference Centiles for Sprint Performance in High-Level Youth Soccer Players: The Need To Consider Biological Maturity’””

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Ludwig Ruf TSG ResearchLab gGmbH, Zuzenhausen, Germany
TSG 1899 Hoffenheim, Zuzenhausen, Germany

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Stefan Altmann TSG ResearchLab gGmbH, Zuzenhausen, Germany
Department for Performance Analysis, Institute of Sports and Sports Science, Karlsruhe Institute of Technology, Karlsruhe, Germany

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Christian Kloss TSG 1899 Hoffenheim, Zuzenhausen, Germany

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Sascha Härtel TSG 1899 Hoffenheim, Zuzenhausen, Germany

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  • 1.

    Cumming S, Pi-Rusiñol R, Rodas G, Drobnic F, Rogol A. The validity of automatic methods for estimating skeletal age in young athletes: a comparison of the BAUSport Ultrasound System and BoneXpert with the Radiographic method of Fels. Biol Sport. 2024;41:617. doi:

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  • 2.

    Datson N, Weston M, Drust B, Atkinson G, Lolli L, Gregson W. Reference values for performance test outcomes relevant to English female soccer players. Sci Med Footb. 2022;6:58996. doi:

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  • 3.

    Lolli L, Gregson W, Bonanno D, Kuitunen S, Di Salvo V. Age-related reference intervals for physical performance test outcomes relevant to male youth Middle Eastern football players. Int J Sports Physiol Perform. 2023;18:128395. doi:

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  • 4.

    Malina RM. Skeletal age and age verification in youth sport. Sports Med. 2011;41:92547. doi:

  • 5.

    Ruf L, Altmann S, Kloss C, Härtel S. Normative reference centiles for sprint performance in high-level youth soccer players: the need to consider biological maturity. Pediatr Exerc Sci. 2024;36(4):192200. doi:

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