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

BMC Medical Imaging

Jörg Fuchslocher¹  Michael Romann¹ 

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

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

Others  :  1125922
DOI  :  10.1186/s12880-015-0042-7

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

【 摘 要 】

Background

The 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).

Methods

Paired 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.

Results

Intrarater 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.

Conclusion

DXA 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】

   
2015 Romann and Fuchslocher; licensee BioMed Central.

【 图 表 】

Figure 1.

Figure 2.

【 参考文献 】

• [1]Hönekopp J, Schuster M: A meta-analysis on 2D: 4D and athletic prowess: Substantial relationships but neither hand out-predicts the other. Personal Individ Differ 2010, 48:4-10.
• [2]Malas MA, Dogan S, Hilal Evcil E, Desdicioglu K: Fetal development of the hand, digits and digit ratio (2D: 4D). Early Hum Dev 2006, 82:469-75.
• [3]Trivers R, Manning J, Jacobson A: A longitudinal study of digit ratio (2D: 4D) and other finger ratios in Jamaican children. Horm Behav 2006, 49:150-6.
• [4]Manning JT, Scutt D, Wilson J, Lewis-Jones DI: The ratio of 2nd to 4th digit length: a predictor of sperm numbers and concentrations of testosterone, luteinizing hormone and oestrogen. Hum Reprod 1998, 13:3000-4.
• [5]Hall LS, Love CT: Finger-length ratios in female monozygotic twins discordant for sexual orientation. Arch Sex Behav 2003, 32:23-8.
• [6]Manning JT, Taylor RP: Second to fourth digit ratio and male ability in sport: implications for sexual selection in humans. Evol Hum Behav 2001, 22:61-9.
• [7]Bailey AA, Hurd PL: Finger length ratio (2D: 4D) correlates with physical aggression in men but not in women. Biol Psychol 2005, 68:215-22.
• [8]Pokrywka L, Rachoń D: Suchecka‐Rachoń K, Bitel L. The second to fourth digit ratio in elite and non‐elite female athletes. Am J Hum Biol 2005, 17:796-800.
• [9]Nicholls ME, Orr CA, Yates MJ, Loftus AM: A new means of measuring index/ring finger (2D: 4D) ratio and its association with gender and hand preference. Laterality 2008, 13:71-91.
• [10]Caswell N, Manning JT: A comparison of finger 2D: 4D by self-report direct measurement and experimenter measurement from photocopy: methodological issues. Arch Sex Behav 2009, 38:143-8.
• [11]Paul SN, Kato BS, Cherkas LF, Andrew T, Spector TD: Heritability of the second to fourth digit ratio (2d: 4d): A twin study. Twin Res Hum Genet 2006, 9:215-9.
• [12]Robertson J, Zhang W, Liu J, Muir K, Maciewicz R, Doherty M: Radiographic assessment of the index to ring finger ratio (2D: 4D) in adults. J Anat 2008, 212:42-8.
• [13]Allaway HC, Bloski TG, Pierson RA, Lujan ME: Digit ratios (2D: 4D) determined by computer‐assisted analysis are more reliable than those using physical measurements, photocopies, and printed scans. Am J Hum Biol 2009, 21:365-70.
• [14]Auger J, Le Denmat D, Berges R, Doridot L, Salmon B, Canivenc-Lavier MC, et al.: Environmental levels of oestrogenic and antiandrogenic compounds feminize digit ratios in male rats and their unexposed male progeny. Proc R Soc B Biol Sci 2013, 280:1-8.
• [15]Hall EJ, Brenner D: Cancer risks from diagnostic radiology. Br J Radiol 2008, 81:362-78.
• [16]Kleinerman RA: Cancer risks following diagnostic and therapeutic radiation exposure in children. Pediatr Radiol 2006, 36:121-5.
• [17]Ron E: Cancer risks from medical radiation. Health Phys 2003, 85:47-59.
• [18]Mettler FA Jr, Huda W, Yoshizumi TT, Mahesh M: Effective doses in radiology and diagnostic nuclear medicine: a Catalog1. Radiology 2008, 248:254-63.
• [19]RSNA. 2014. Patient Safety: Radiation Dose in X-Ray and CT Exams. [http://www.radiologyinfo.org/en/safety/index.cfm?pg=sfty_xray]
• [20]International Commission of Radiological Protection (ICRP): Radiological protection in paediatric diagnostic and interventional radiology. ICRP Publication 121 Ann ICRP 42. International Commission of Radiological Protection (ICRP), Oxford; 2013.
• [21]Gordon CM, Bachrach LK, Carpenter TO, Crabtree N, El-Hajj Fuleihan G, Kutileg S, et al.: Dual energy X-ray absorptiometry interpretation and reporting in children and adolescents: the 2007 ISCD pediatric official positions. J Clin Densitom 2008, 11:43-58.
• [22]Płudowski P, Lebiedowski M, Lorenc RS: Evaluation of the possibility to assess bone age on the basis of DXA derived hand scans—preliminary results. Osteoporos Int 2004, 15:317-22.
• [23]International Atomic Agency (IAEA): Applying Radiation Safety Standards in Diagnostic Radiology and Interventional Procedures Using X Rays. IAEA safety standards series No. 39. IAEA, Vienna; 2006.
• [24]Baker J, Horton S: A review of primary and secondary influences on sport expertise. High Ability Stud 2004, 15:211-28.
• [25]Duda J, Treasure D: Toward optimal motivation in sport: Fostering athletes’ competence and sense of control. In Applied sport psychology: Personal growth to peak performance. 4th edition. Edited by Williams JM. Mayfield Press, Mountain View; 2001:1-41.
• [26]Cobley S, Baker J, Wattie N, McKenna J: Annual Age-grouping and athlete development: a meta-analytical review of relative Age effects in sport. Sports Med 2009, 39:235-56.
• [27]Romann M, Fuchslocher J: Relative age effects in Swiss junior soccer and their relationship with playing position. Eur J Sport Sci 2013, 13:356-63.
• [28]Côté J: The influence of the family in the development of talent in sport. Sport Psychol 1999, 13:395-417.
• [29]Manning J, Wood S, Vang E, Walton J, Bundred P, van Heyningen C, et al.: Second to fourth digit ratio (2D: 4D) and testosterone in men. Asian J Androl 2004, 6:211-6.
• [30]Vehmas T, Solovieva S, Leino-Arjas P: Journal of negative results in BioMedicine. J Negat Results Biomed 2006, 5:12. BioMed Central Full Text
• [31]Bland JM, Altman DG: Measuring agreement in method comparison studies. Stat Methods Med Res 1999, 8:135-60.
• [32]Rosner BA: Fundamentals of biostatistics. Duxbury, Boston; 2011.
• [33]Manning J, Kilduff L, Cook C, Crewther B, Fink B: Digit ratio (2D: 4D): a biomarker for prenatal sex steroids and adult sex steroids in challenge situations. Front Endocrinol 2014, 5:1-5.
• [34]Jürimäe T, Voracek M, Jürimäe J, Lätt E, Haljaste K, Saar M, et al.: Relationships between finger-length ratios, ghrelin, leptin, IGF axis, and sex steroids in young male and female swimmers. Eur J Appl Physiol 2008, 104:523-9.
• [35]Voracek M, Reimer B, Dressler S: Digit ratio (2D: 4D) predicts sporting success among female fencers independent from physical, experience, and personality factors. Scand J Med Sci Sports 2010, 20:853-60.
• [36]Bennett M, Manning J, Cook C, Kilduff L: Digit ratio (2D: 4D) and performance in elite rugby players. J Sports Sci 2010, 28:1415-21.
• [37]Manning J, Hill M: Digit ratio (2D: 4D) and sprinting speed in boys. Am J Hum Biol 2009, 21:210-3.
• [38]Hill R, Simpson B, Manning J, Kilduff L: Right–left digit ratio (2D: 4D) and maximal oxygen uptake. J Sports Sci 2012, 30:129-34.
• [39]Ranson R, Taylor S, Stratton G: Reliability of a field based 2D: 4D measurement technique in children. Early Hum Dev 2013, 89:589-92.
• [40]Peeters MW, Claessens AL: The left hand second to fourth digit ratio (2D: 4D) does not discriminate world-class female gymnasts from age matched sedentary girls. PLoS One 2012, 7:e40270.