A comparison by statistical methods of certain external pelvic measurements of French and American women

Abstract

Summary 1. French and American pelves show the same general external form. 2. The French pelves are in the main slightly smaller than the American. The average external measurements of the French are uniformly smaller than the American. 3. The range of variations of external measurements is generally somewhat greater in the French than in the American. 4. The standard deviation is about the same for the French and the American pelves, some measurements showing slightly more in the American, others a slightly greater deviation in the French. 5. The coefficient of variability is quite low and is about the same for both groups. 6. The correlation of the different measurements is definitely lower in the American than in the French pelves. The same measurements, however, show about the same order of correlation in both series, the lowest correlation being between the external conjugate and the interspinous, and the highest between the interspinous and the intercristal.