Journal List > Korean J Phys Anthropol > v.28(4) > 1039187

Cho and Kim: Change of Second to Fourth Digit Ratio according to Age in Korean Children

Abstract

The 2nd to 4th digit ratio (2D : 4D) reflects exposure level of sex hormones in fetal period. The aim of this study is to identify a change of digit ratio according to age and a critical age showing gender difference in Korean children. This study was done on 1,182 children (588 males, 594 females). Data were collected by measuring index and ring finger length on both hands by photocopy. The data were analyzed using SPSS win 21.0. This study showed that the 2nd and 4th finger length and digit ratio of both hands increased with age both male and female. There was no differences in 2nd to 4th digit ratio between males and females until they were 3 years old. However, there were significant differences in 2nd to 4th digit ratio between males and females from the age of four. The results suggest that digit ratio in Korean children increases with age and a critical age showing gender difference is from the age of four.

Figures and Tables

Fig. 1

This is a graph showing changes of right second to fourth digit ratio according to age between males and females.

kjpa-28-197-g001
Fig. 2

This is a graph showing changes of left second to fourth digit ratio according to age between males and females.

kjpa-28-197-g002
Table 1

Distribution of the sample according to gender and age (N=1,182)

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Table 2

Characteristics of second and fourth finger length according to gender and age in right hand (N=1,182)

kjpa-28-197-i002

M; mean, SD; standard deviation

*p<.05

Table 3

Characteristics of second and fourth finger length according to gender and age in left hand (N=1,182)

kjpa-28-197-i003

M; mean, SD; standard deviation

**p<.01

References

1. Manning JT, Stewart A, Bundred PE, Trivers RL. Sex and ethnic differences in 2nd to 4th digit ratio of children. Early Hum Dev. 2004; 80:161–168.
2. Choi KH, Kwon SO. Growth and Fitness : Sex Differences in Ratio of the Lengths of the Second to Fourth Digits(2D:4D). Korean J Growth Dev. 2007; 15:155–159.
3. Hönekopp J, Watson S. Meta-analysis of digit ratio 2D : 4D shows greater sex difference in the right hand. Am J Hum Biol. 2010; 22:619–630.
4. Brosnan MJ. Digit ratio as an indicator of numeracy relative to literacy in 7-year-old British schoolchildren. Br J Psychol. 2008; 99:75–85.
5. Rahman AA, Lophatananon A, Stewart-Brown SS, Harriss D, Anderson J, Parker T, et al. Hand pattern indicates prostate cancer risk. Br J Cancer. 2011; 104:175–177.
6. Kyriakidis I, Papaioannidou P, Pantelidou V, Kalles V, Gemitzis K. Digit ratios and relation to myocardial infarction in Greek men and women. Gend Med. 2010; 7(6):628–636.
7. Manning JT, Taylor RP. Second to fourth digit ratio and male ability in sport: Implications for sexual selection in humans. Evol Hum Behav. 2001; 22:61–69.
8. Manning JT, Fink B. Digit ratio (2D : 4D) and aggregate personality scores across nations: Data from the BBC internet study. Pers Indiv Differ. 2011; 51:387–391.
9. Hönekopp J, Thierfelderp C. Relationships between digit ratio (2D : 4D) and sex-typed play behavior in pre-school children. Pers Indiv Differ. 2009; 47:706–710.
10. Lutchmaya S, Baron-Cohen S, Raggatt P, Knickmeyer R, Manning JT. 2nd to 4th digit ratios, fetal testosterone and estradiol. Early Hum Dev. 2004; 77(1-2):23–28.
11. Malas MA, Dogan S, Evcil EH, Desdicioglu K. Fetal development of the hand, digits and digit ratio (2D : 4D). Early Hum Dev. 2006; 82(7):469–475.
12. Saenz J, Alexander GM. Digit ratios (2D : 4D), postnatal testosterone and eye contact in toddlers. Biol Psychol. 2013; 94:106–108.
13. Ventura T, Gomes MC, Pita A, Neto MT, Taylor A. Digit ratio (2D:4D) in newborns: Influences of prenatal testosterone and maternal environment. Early Hum Dev. 2013; 89:107–112.
14. Alexander GM, Wilcox T, Farmer ME. Hormone-behavior associations in early infancy. Horm Behav. 2009; 56:498–502.
15. Knickmeyer RC, Woolson S, Hamer RM, Konneker T, Gilmore JH. 2D : 4D ratios in the first 2 years of life: Stability and relation to testosterone exposure and sensitivity. Horm Behav. 2011; 60:256–263.
16. Lutchmaya S, Baron-Cohen S, Raggatt P, Knickmeyer R, Manning JT. 2nd to 4th digit ratios, fetal testosterone and estradiol. Early Hum Dev. 2004; 77:23–28.
17. McIntyre MH, Barrett ES, McDermott R, Johnson DDP, Cowden J, Rosen SP. Finger length ratio (2D : 4D) and sex differences in aggression during a simulated war game. Pers Indiv Differ. 2007; 42:755–764.
18. Kim SI, Cho KJ. Differences of second to fourth digit ratio according to the methods of measuring length. Korean J Phys Anthropol. 2013; 26(1):25–32.
19. Trivers R, Manning JT, Jacobson A. A longitudinal study of digit ratio (2D : 4D) and other finger ratios in Jamaican children. Horm Behav. 2006; 49:150–156.
20. Manning JT, Trivers RL, Thornhill R, Singh D. The 2nd : 4th digit ratio and asymmetry of hand performance in Jamaican children. Laterality. 2000; 5:121–132.
21. Williams JH, Greenhalgh KD, Manning JT. Second to fourth finger ratio and possible precursors of developmental psychopathology in preschool children. Early Hum Dev. 2003; 72:57–65.
22. Jo HU. The second to fourth digit ratio in Korean children: A cross-sectional study. Unpublished master's thesis. Eulji University;2014. –. .
23. Manning JT, Fink B, Neave N, Caswell N. Photocopies yield lower digit ratios (2D : 4D) than direct finger measurements. Arch Sex Behav. 2005; 34:329–333.
24. Almasry SM, El Domiaty MA, Algaidi SA, Elbastawisy YM, Safwat MD. Index to ring digit ratio in Saudi Arabia at Almadinah Almonawarah province: a direct and indirect measurement study. J Anat. 2011; 218(2):202–208.
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