Dermatoglyphics a method of sex differentiation: a study.
AIMS AND OBJECTIVES OF THIS STUDY: Despite the fact that the differences in epidermal ridge density between men and women have been accepted for some time, they have only been thoroughly demonstrated in a small number of populations. The aim of this study is to determine whether such differences exist in a sample of the Indian population by counting epidermal ridges within three well-defined fingerprint areas. If significant differences do exist, then the likelihood of inferring sex from given ridge densities will be explored.
MATERIALS AND METHODS: A total of 200 MBBS students of Kalinga Institute of Medical Sciences, Bhubaneswar, ODISSA, volunteered for the study. The study population consisted of 100 males and 100 females. Informed consent was taken from the study individuals. Institute Ethics committee guidelines relating to the use of human subjects for research purposes are duly followed.
The materials used for this study were printers black ink, glass plate, roller, horseshoe lens, transparent film strip, and pencil, measuring tape, bathroom scale, pin and Performa. The prints are taken with the fingers applied with regular & firm pressure on the Performa. In this way for each and every individual the entire prints of ten fingers are prepared. Only plain prints are taken (No roll prints). The parameters are analyzed including the pattern frequency, pattern intensity index and total finger ridge count with sex differentiation.
OBSERVATION: Total 200 nos. of students volunteered for this study, so 2000 fingers were analyzed for this purpose. It is observed that the frequency of the digital patterns and sex differentiation obtained from the study of 200 KIMS, MBBS student subjects. Loops were the most predominant pattern (33.25%) followed by whorls (28.75%), Plain arches (20.5%), and the least were the tented arch (3.25%). Plain arches were significantly greater in females than in males. (Table 1).
It is found that the ridge density ranges 3 to 10/25[mm.sup.2] are for the males & 12 to15/25[mm.sup.2] onwards is for the females. Only there is a very small overlapping at 11/25[mm.sup.2], where 6 males among 100 and 1 female among 100 females are matched. (Table 2).
DISCUSSION: Many studies have been conducted on ridge count but, mainly for race determination and genetic inheritance of ridge pattern. The present study is conducted to broaden the horizon of ridge count i.e. sex determination by finger print ridge density. The findings available in this study will be correlated to the findings of the studies carried out by various researchers in the different parts of the world. The statistical analysis and the favored odds show that a ridge count of [greater than or equal to] 11 ridges/25[mm.sup.2] is more likely to be of male origin and a ridge count of [greater than or equal to] 12/25[mm.sup.2] is more likely to be of female origin. A print showing a count of [greater than or equal to] 10/25mm.[sq..sup.2] will have a high probability to be that of male, while no female in this study was found to have 10 ridges. Similarly a ridge count of [greater than or equal to] 13 ridges/25[mm.sup.2] will be more in favor of female, while there was no male found in this category.
In the past many studies have been conducted on the finger print ridges with the idea of proving a gender difference in the finger print, but failed in the methodology. According to Reddy, (1) the mean ridge count for males is 13.41 and that of female is 12.04. These figures were exactly the opposite of Acree. (2) A similar study was done on males and females of American Negroes and Caucasian American by Plato et al. (3) Here again they found the mean ridge density in male is more than female. These results could be due to some defect in the counting method as there is no detail of the counting method. Cummins and Midlo (4) have established that females do have higher mean ridge count (23.4) than males (20.7). These values are higher than the present study. This may be because the number of subjects studied is less and due to geographical variation. Moore (5) also carried out a study on ridge to ridge distance and found that mean distance is more in male compared to female, but he studied only 10 males and 10 females. Okajima (6) also found that fork index is higher in females than in male in fingerprints. This again upholds the trend as in this present study.
The most prevalent digital ridge pattern type is loops (33.25%) followed by whorls(28.75%), plain arches (20.5%), ulnar loops (14.25%), and the least prevalent is tented arch (3.25%) according to this study and these values are not in conformity with the work of Boroffice, (7) which showed that ulnar loops were the most predominant pattern (50.09%) and the least was the radial loops (1.13%) in the study of digital dermatoglyphic pattern in a sample of the Nigerian populations. Jaja and Igbigbi (8) in their work on the digital and palmar dermatoglyphics of the Ijaw of Southern Nigeria reported the ulnar loops as being the most prevalent digital ridge pattern type, followed by whorls, arches and the least being the radial loops.
In this study, loops were higher (38%) in males than females (28.5%). Sex differences in the distribution of the patterns are statistically significant along with the ridge density.
A cross sectional study of palmar and digital patterns randomly in Malawian subjects carried out by Igbigbi and Msamati (9) showed that the arches were the most predominant digital pattern in both sexes followed by radial loops in males and whorls in females. In the same study on Zimbabweans, ulnar loop were the most predominant digital pattern type in both sexes followed by whorls in males and arches in females. These disparities may be due to genetic as well as environmental factors and it has been reported that digital dermatoglyphics patterns are genetically determined and influenced by environmental, physical and topological factors.
CONCLUSION: Identification by finger prints is infallible and now with the help of this study it will be further helpful to the fingerprint experts to direct their search to a particular gender and eventually the investigating officers would save time in nabbing suspects.
The ridge density is a characteristic parameter to determine sex from fingerprints i.e., <12 (male) and [greater than or equal to] 12 (female) .Pattern of fingerprint is most likely to be a specific parameter.
Table 1: Showing no. Of individuals per pattern with respect to their sex of 19 to 23 years age group. (Both Hands are taken into Account & Patterns are Analysed).
Table 2: Showing no. of individuals per specific ridge density ranges with respect to their sex of 19 to 23yrs of age group (Verrified & Analyzed).
STATISTICS: There is no difference between the biometric measurements of ridges of males & females.
Total no of spots from which Biometric measure have been taken = 2000.
Degree of freedom in 2x3 table = (2-1) (3-1)=2
Expected frequencies for the above table.
[MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]
Hence the test is highly significant and it implies that there is significant difference between the biometric measurements of ridges within males and females. P<.001.
P value < .001
(1.) Reddy GG (1975 March): 'Finger dermatoglyphics of the Bagathas of Araku Valley (A. P.) India.' Am J Phys Anthropol. 1975 Mar, 42(2): 225-8.
(2.) Acree Mark A (1999): 'Is there a gender difference in fingerprint ridge density? Forensic Science International.' 102: 35-44.
(3.) Plato CC, Cereglino JJ, Steinberg FS (1975): 'The Dermatoglyphics of American Caucasian' Am J Phy Antrhop, 42: 192-210.
(4.) Cummins H, Midlo C (1961): 'Fingerprints, Palms and Soles. An introduction to dermatoglyphics.' Dover Publ, New York'272.
(5.) Moore RT (1994): 'Automatic fingerprint identification systems. In H.C. Lee, R.E. Gaensslen (Eds.) Advances in Fingerprint Technology, CRC Press, Boca Raton, FL.'169.
(6.) Okajima M. (1970): 'Frequency of fork in epidermal ridge minutiae in fingerprint.' Am J Phys Anthrop 32: 41-48.
(7.) Boroffice RA (1978 Aug): 'Digital dermatoglyphic patterns in a sample of the Nigerian population.' Am J Phy Anthropol, 49(2): 167-70.
(8.) Jaja BN, Igbigbi, PS (2008 March). 'Digital and palmar dermatoglyphics of the Ijaw of Southern Nigeria'. Afr J Med Med Sci. 37(1): 1-5.
(9.) Igbigbi PS, Msamati BC (1999 Dec.) 'Palmar and digital dermatoglyphic patterns in Malawian subjects'. East Afr Med J. 76(12): 668-71.
Asis Kumar Ray , Rathin Kumar Duari , S. N. Gole 
[1.] Asis Kumar Ray
[2.] Rathin Kumar Duari
[3.] S. N. Gole
PARTICULARS OF CONTRIBUTORS:
[1.] Associate Professor, Department of Forensic Medicine & Toxicology, Kalinga Institute of Medical Sciences, Bhubaneswar.
[2.] Assistant Professor, Department of Forensic Medicine & Toxicology, Kalinga Institute of Medical Sciences, Bhubaneswar.
[3.] Post Graduate Student, Department of Forensic Medicine & Toxicology, Kalinga Institute of Medical Sciences, Bhubaneswar.
FINANCIAL OR OTHER COMPETING INTERESTS: None
NAME ADDRESS EMAIL ID OF THE CORRESPONDING AUTHOR:
Dr. Asis Kumar Ray, Plot 477, Saheed Nagar, Bhubaneswar-751007, Odisha.
Date of Submission: 28/05/2015. Date of Peer Review: 29/05/2015. Date of Acceptance: 11/06/2015. Date of Publishing: 16/06/2015.
Table 1 Digital Patterns Males Females Row Total Whorl 330(33%) 245(24.5%) 575(28.75%) Ulnar Loop 155(15.5%) 130(13%) 285(14.25%) Loop 380(38%) 285(28.5%) 665(33.25%) T ented Arch 35(3.5%) 30(3.0%) 65(3.25%) Plain Arch 100(10%) 310(31.0%) 410(20.5%) Column Total 1000 1000 2000 Table 2 Ridge density Males Females 3 to 6 /25 mm 27(27%) 0(0%) 6 to 10 /25 mm 66(66%) 0(0%) 11 /25 mm 6(6%) 1(1%) 12 to 15 /25 mm 1(1%) 71(71%) 15/25mm onwards 0(0%) 28(28%) Table 3 Digital patterns Male Female Total 287.5 287.5 575 Whorl Loops Archs 475 475 950 237.5 237.5 475 Total 1000 1000 2000
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|Title Annotation:||ORIGINAL ARTICLE|
|Author:||Ray, Asis Kumar; Duari, Rathin Kumar; Gole, S.N.|
|Publication:||Journal of Evolution of Medical and Dental Sciences|
|Date:||Jun 18, 2015|
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