Received: March 26, 2008
Accepted: July 04, 2008
Ohagwu CC, Ugwu AC, Idigo FU. Uterine roundness index: model formulation and nomogram for a Nigerian population. Internet Journal of Medical Update 2009 Jan;4(1):25-8.


Mr. Christopher Chukwuemeka Ohagwu, Mr. Anthony Chukwuka Ugwu, and Mr. Felicitas Ugochinyere IdigoØ

Department of Medical Radiology, College of Medical Sciences, University of Maiduguri, Borno State, Nigeria
Department of Medical Radiography and Radiological Science, Faculty of Health Science and Technology, Nnamdi Azikiwe University, Anambra State, Nigeria
ØDepartment of Medical Radiography and Radiological sciences, University of Nigeria, Enugu Campus, Enugu State, Nigeria

(Corresponding Author: Mr. Ugwu Anthony Chukwuka, Department of Medical Radiography, Faculty of Health Sciences and Technology, Nnamdi Azikiwe University, Nnewi Campus, Anambra State, Nigeria, Email:


This study was aimed to establish a nomogram for uterine roundness index (UTRI) for a Nigerian population. Seven hundred Nigerian girls and women in the premenarche, nulliparous, multiparous and postmenopausal groups with normal uteri were evaluated by pelvic ultrasound. The length, anteroposterior and transverse diameters of the uterus were measured and the UTRI calculated as the ratio of anteroposterior diameter to the length. The age, height, and parity of the subject were recorded. The mean UTRI ±SD were 0.44457±0.0629 for premenarche, 0.5880±0.1118 for nulliparous, 0.6005±0.1046 for multiparous and 0.5269±0.1037 for postmenopausal. Pearson’s correlation analysis showed significant correlation between UTRI and age, height and weight in premenarche group and weight in the nulliparous, multiparous and postmenopausal groups (p< 0.05). Significant negative correlation between UTRI and age occurred only in the postmenopausal group (p< 0.05). The study has established a nomogram for UTRI in a Nigeria population which will be of gynaecological importance to sonographers and referring clinicians in assessing the normality of uterine shapes and contour.

KEY WORDS: Uterine roundness index; Uterus; Ultrasound; Nigerian women; Nomogram