Validation of digit-length ratio (2D:4D) assessments on the basis of DXA-derived hand scans

BMC Medical Imaging

Research Article

Jörg Fuchslocher¹  Michael Romann¹ 

[1] Swiss Federal Institute of Sport Magglingen, CH-2532, Magglingen, Switzerland;

关键词: Talent identification;    Young athletes;    Finger length;    Measurement techniques;   

DOI  :  10.1186/s12880-015-0042-7

 received in 2014-07-17, accepted in 2015-01-08,  发布年份 2015

来源: Springer

【 摘 要 】

BackgroundThe second-to-fourth digit-length ratio (2D:4D) may be a correlate of prenatal sex steroids, and it has been linked to sporting prowess. The aim of the study was to validate dual-energy X-ray-absorptiometry (DXA) as a technique to assess 2D:4D in soccer players under 15 years of age (U-15).MethodsPaired X-ray and DXA scans of the left hands of 63 male U-15 elite soccer players (age: 14.0 ± 0.3 years) were performed, and 2D:4D was then compared between the two techniques. The 2D:4D measurements were performed twice by two blinded raters. Intrarater and interrater reliability, as well as agreement between the X-ray and the DXA assessments, were tested.ResultsIntrarater reliabilities of both raters using X-ray with intraclass correlation coefficients (ICCs) of 0.97 and 0.90 were excellent. Using DXA, the ICCs were 0.90 and 0.91 thus also showing excellent reliability. Interrater reliabilities were excellent using both the X-ray (ICC of 0.94) and the DXA (ICC of 0.90), assessments respectively. Bland-Altman plots demonstrated that the 2D:4D ratios of the two raters did not differ significantly between the X-ray and the DXA assessments. The standard errors of estimate were 0.01 for both techniques. The 95% limits of agreement of ±0.018 (±2.0%) and ±0.023 (±2.6%), respectively, were within the acceptable tolerance of 5%, and showed very good agreement.ConclusionDXA offered a replicable technique for assessing 2D:4D in youth soccer players. Therefore, the DXA technique seems to be an alternative method for evaluating 2D:4D in youth sports.

【 授权许可】

CC BY   
© Romann and Fuchslocher; licensee BioMed Central. 2015