The Study of Lip Prints for Sex Determination : A Case Study of Population in Muang District, Samut Songkhram Province
Abstract
The lip prints unique to an individual just like fingerprints used to personal identification and sex determination. This study has the purpose to studies the lip prints pattern and difference for use in sex determination. The samples of this study were 130 Thai population of Muang District, SamutSongkhram Provinceaged between 21-30 years. The subjects with inflammation, deformity, surgical scars, ulcers, of the lips and known hypersensitivity to lipstick were excluded from the study. Lipprints were made byusing dark color and non glossy lipstick. The transparent adhesive tape was carefully lifted from the lips and attached to a piece of paper. The lip prints were classified according to Suzuki and Tsuchihashi Lip prints'sclassification. The lipprints were divided into six quadrants. All the data were recorded and analyzed using SPSS/FW version 16, and presented as frequency and percentages. Chi-square test was used to analyzed the lip prints pattern and compare accuracy with the level of significance p<0.05. The distribution of various types of lip prints were found in all quadrants. Type III pattern did not occur among males and females in all quadrants, and the same lip prints was not found. Type I was predominant in female in first quadrant (81.39%) and Type V was predominant in male in second quadrant (70.45%). The middle 10 mm. of lower lip Q5th were taken as astudy area for sex determination, as only these area is almost always visible in any trace.Type I was predominant in female. While Type IV was predominant in male. p=0.000. The distribution of lip prints type was seen to be statistically significant p<0.05. The samplesshowed 61.364% accuracy in identifying males and 90.698% accuracy in identifying females. The overall accuracy of sex determination was 80.769%. Therefore, the lip prints are considered unique to an individual and analogous to fingerprints.Lip trace was leave at a crime scene can be linked to the suspect. It is potential tool and usefulness in personal identification and sex determination in forensic science.
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