Epidemiological Trends of Urolithiasis at the Global, Regional, and National Levels: A Population-Based Study

Figure 2

The ratio of male to female incidence in different age groups in 2019. (a) Global level. (b) High SDI regions. (c) High-middle SDI regions. (d) Middle SDI regions. (e) Middle-low SDI regions. (f) Low SDI regions. SDI: socio-demographic index.