Authors' Reply: Clarifying GBD 2023 Life Expectancy Estimates for Monaco

This correspondence, published in The Lancet, serves as an official reply from the authors of the Global Burden of Diseases, Injuries, and Risk Factors Study (GBD) 2023. It addresses concerns raised by Grant M A Wyper and colleagues regarding a notable discrepancy between the GBD 2023 life expectancy estimates for the microstate of Monaco and figures previously published by local authorities. The authors acknowledge the complexities inherent in estimating health metrics for small populations, which often present unique statistical challenges due to limited data volume and high variability. Rather than dismissing the critique, the response welcomes further academic engagement and dialogue on methodological improvements for small-population estimation. The primary purpose of this piece is to offer several technical clarifications to explain the differences in the reported data. By addressing these specific discrepancies, the authors aim to enhance the transparency and accuracy of global health statistics. This exchange highlights the ongoing scientific process of refining epidemiological models and ensuring that global studies accurately reflect local realities, particularly for unique demographic entities like Monaco.