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Variability of Finger Ridge Density among Thai Adolescents | OMICS International | Abstract
ISSN: 2157-7145

Journal of Forensic Research
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Research Article

Variability of Finger Ridge Density among Thai Adolescents

Somsong Nanakorn* and Wibhu Kutanan

Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen City 40002, Thailand

*Corresponding Author:
Somsong Nanakorn
Department of Biology, Faculty of Science
Khon Kaen University, Khon Kaen City 40002, Thailand
Tel: +66 43 202531
E-mail: [email protected]

Received Date: August 06, 2012; Accepted Date: August 16, 2012; Published Date: August 24, 2012

Citation: Nanakorn S, Kutanan W (2012) Variability of Finger Ridge Density among Thai Adolescents. J Forensic Res S1:005. doi: 10.4172/2157-7145.S1-005

Copyright: © 2012 Nanakorn S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Finger ridge density (RD) is the number of finger ridges that touch the diagonal line drawn between a square of 25 mm2 which is placed on the core of the fingerprint image. It has been useful as a sex determination aid in forensic practice as its values are significantly higher in females than males. The present study was aimed at investigating the RD of Thai adolescents aged between 10 and 12 years old. Subjects were 130 schoolboys and 130 schoolgirls were randomly selected and signed informed consent forms prior to printing each individual’s ten fingers by using the adhesive transparent tape technique. The Microsoft Word program was applied for precise counting of RD. The mean RD differences between left and right hands, boys and girls, radial and ulnar areas were statistically tested. The likelihood ratio was computed to obtain the probability inferences of sex, and posterior probabilities were estimated using Bayes’ theorem. Results revealed as follows: (1) The mean RDs (ridges per 25 mm2) of boys and girls were not significantly different across the radial (15.89 vs. 16.19, respectively) and ulnar areas (15.84 vs. 16.00, respectively). For each sex, mean RDs in the radial and the ulnar were not statistically different. (2) The mean RDs in both sexes were greater in the left hand fingers compared to the right hand, and were statistically significant only in girls. (3) For the ulnar area, the RD of 13 or less is most likely to be of from male origin and that of 17 or more has a low probability of being of female origin. Comparing the radial area, an RD of 14 or less has a low probability of being of male origin while a weak probability of the RD of 17 or more is most likely being of female origin.

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