한국인에서 성결정인자로서의 집게손가락과 반지손가락의 길이비
Second to Fourth Digit Ratio as a Sex Determinant in Korean
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태아의 출생 전 반지손가락의 발육은 태내의 테스토스테론 수치에 민감하게 반응해서 이루어지며, 집게손가락은 에스트로겐의 영향을 받는 것으로 알려져 있다. 이렇게 성호르몬의 영향을 받은 집게손가락과 반지손가락의 길이비(2D : 4D)는 성별, 인종, 민족에 따라서도 다르다. 본 연구에서는 한국인 20대 성인 남녀의 손가락 길이비의 특성과 성구별 예측력을 알아보고자 하였다. 연구대상은 대학생 664명(남자 332명, 여자 332명)이었으며, 캘리퍼를 이용하여 양손의 집게손가락과 반지손가락 길이를 각각 직접 측정한 후 길이비를 산출하였다. 자료는 SPSS 19.0 win을 이용하여, 빈도분석, X2 test,independent t-test, paired t-test, Pearson’s correlation coefficient로 분석하였다. 연구결과, 성별에 따른 집게손가락과 반지손가락의 길이비는 남자가 0.96, 여자가 0.97로 나타났으며, 유의한차이가 있었다(p⁄.001). 또한 집게손가락과 반지손가락의 길이 유형 중 제1유형은 남자에서 많았고, 제2유형과제3유형은 여자에서 많았다. 뿐만 아니라 남녀 모두 좌우 집게손가락과 반지손가락의 길이비 사이에 유의한 차이가 있었으며, 좌우 집게손가락과 반지손가락의 길이비의 상관관계는 남자 r=.530, 여자 r=.556 (p⁄.001)이었다. 집게손가락과 반지손가락의 길이비는 왼손에서 남자의 89.1%, 여자의 89.2%, 오른손에서 남자의 91.8%, 여자의 91.9%의 성을 정확하게 구별할 수 있었다. 결론적으로 한국인의 집게손가락과 반지손가락의 길이비는 유의한 성차이가 있었으며, 집게손가락과 반지손가락의 길이비는 성을 구별할 수 있는 결정인자 중의 하나로 활용할 수 있을 것이다.
Abstract
The 2nd to 4th digit ratio (2D : 4D) as a predictor of the degree of expression of sexually dimorphic and other sex-hormone-mediated traits differs between the sexes, ethnics and race. The aim of this study is to identify characteristics and role of 2nd to 4th digit ratio as a sex determinant in Korean. This study was done on 664 individuals (332 males, 332 females). Data were collected by measuring index and ring finger length on both hands with digital callipers. The data were analyzed through the frequency, descriptive statistics, X2 test, independent t-test, paired t-test, Pearson correlation analysis using SPSS win 19.0. This study showed that the 2nd to 4th digit ratio (2D : 4D) in Korean men (0.96) was significantly lower than that of women (0.97). There was a significant difference in the types of 2nd and 4th finger length according to sex. There was a significant difference between right 2D : 4D and left 2D : 4D both of Korean men and women. Correlation between right and left hand digit ratio was .530 in men and .556 in women. The 2nd to 4th digit ratio accurately determinated sex in 89.1% males and 89.2% females for the left hand, and in 91.8% males and 91.9% females for the right hand. The results of this study suggest that 2nd to 4th digit ratio in Korean differs between males and females, moreover,it will be able to perform a role as a sex determinant.
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