Inter-observer agreement of the Suchey-Brooks method from a French computed tomography sample

Abstract Aim of the work In forensic anthropology, the estimation of age at death is required to establish a biological profile and facilitate individual identification. The pubic symphysis represents one of the most studied skeletal structures due to its late maturation. In this respect, the Suchey-Brooks (SB) system is one of the most commonly used methods of assessment based on the morphological characteristics of the pubic symphysis. However, the SB method has certain drawbacks, including frequently inaccurate estimation for individuals over 40 years old. The main aim of this work was to study the inter-observer agreement in the SB method then to test the errors of estimation by three observers with heterogeneous experience from a computed tomography sample for individuals aged between 15 and 98 years old. Patients and methods We retrospectively studied pubic bones from 50 males and 50 females undergoing clinical multislice computed tomography (MSCT) in a French hospital between November 2017 and April 2018. Results The inter-observer reliabilities, with or without the early and advanced patterns, were excellent between the observers (kappa values between 0.8 and 0.95). By focusing on the first three phases (I–III) versus the last three phases (IV–VI), there was no significant difference between the inter-observer reliabilities (kappa values between 0.44 and 0.85). Conclusion The inaccuracy rose with age, showing a growing underestimation from 40 years old and beyond. Besides, we highlighted a moderate overestimation for younger individuals. These errors of estimation were slightly dependent on the experience of the observer.