Published Online: 1 January 1985
Page Count: 8
Museum technician, Division Physical Anthropology, Museum of Natural History, Smithsonian Institution,
Associate professor, University of Maryland School of Medicine, Baltimore, MD
Chief mathematical statistician, Mathematics and Statistics Branch, Smithsonian Institution,
(Received 17 March 1984; accepted 7 May 1984)
The pelves of 100 white skeletons were measured on both sides for the following: (1) length from the superiormost aspect of the public symphysis to the nearest rim of the acetabulum (PS-A), (2) length from the highest point of the public tubercle to the nearest rim of the acetabulum (PT-A), (3) acetabular diameter (AD), (4) the vertical distance from the anterior aspect of the ischial tuberosity to the farthest rim of the acetabulum (IT-A), and (5) greatest femur head diameter. From these, three indices were derived: AD/PS-A (acetabulum/pubis index), AD/PT-A (acetabular diameter/pubic tubercle-acetabular rim index), and IT-A/PS-A (ischium-acetabulum height/public symphysis-acetabular rim index). The left AD/PS-A ratio and left IT-A height proved statistically to be of greatest discriminating value. Using these two variables, a discriminant function was derived which correctly separated 98% of our sample. The acetabulum/pubis ratio alone correctly assigned 95%. With either the discriminant function analysis of two variables or the acetabulum/pubis index as a single predictor, 97% of our sample of known sex was correctly identified if all specimens that fell within a doubtful or overlapping range of values were sorted by femur head diameter.
Paper ID: JFS10979J