한국인 소아에서 연령에 따른 둘째-넷째손가락 길이비의 변화 특성
Change of Second to Fourth Digit Ratio according to Age in Korean Children
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초록
둘째-넷째손가락 길이비 (2D : 4D)는 태아기 성호르몬의 노출 정도를 반영하는 것으로, 둘째-넷째손가락 길이비에 성별 차이가 나타나는 시점에 대해서는 다양한 견해가 있다. 둘째-넷째손가락 길이비가 인종과 민족에 따라 차이가 있다는 점을 고려하여, 본 연구에서는 한국인 소아를 대상으로 연령에 따른 둘째-넷째손가락 길이비의 변화를 파악하고 성별에 따라 차이가 나타나는 결정적 시점을 밝히고자 시도하였다. 연구 대상은 만 1세부터 만 6세까지의 소아1182명 (남자 588명, 여자 594명)이었으며, 둘째손가락과 넷째손가락 길이 측정은 복사본을 측정하는 방법을 이용하였다. 자료분석은 SPSS win PC 21.0을 이용하여 분석하였다. 연구결과, 양손의 둘째손가락 길이와 넷째손가락 길이는 연령이 증가함에 따라 남녀 모두 점차적으로 길이가 길어졌다. 또한 양손의 둘째-넷째손가락 길이비도 연령이 증가함에따라 남녀 모두 대체로 증가하는 것으로 나타났다. 특히 만 3세까지는 성별에 따라 둘째-넷째손가락 길이비에서 통계적으로 유의한 차이가 나타나지 않았으나, 만 4세부터는 유의한 차이가 있는 것으로 나타났다. 따라서 한국인 소아에서둘째-넷째손가락 길이비가 성별에 따라 유의한 차이가 나타나는 결정적 시점은 만 4세부터라고 할 수 있다.
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.
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