3.1. Global Trend of Chronic Kidney Disease (CKD) Due to Hypertension
From 1990 to 2021, global health indicators experienced significant changes, with the global death rate increasing from 148,983 (95%UI 123,167 to 176,985) to 454,359 (95%UI 381,291 to 524,688), DALYs rising from 4,344,896 (95%UI 3,676,494 to 5,110,004) to 24,467,653 (95%UI 22,861,634 to 26,230,869), prevalence growing from 11,712,345 (95%UI 10,891,658 to 12,623,876) to 24,467,653 (95%UI 22,861,634 to 26,230,869), and incidence also increasing from 463,924 (95%UI 426,189 to 505,831) to 1,282,205 (95%UI 1,195,230 to 1,366,296). These changes not only reveal the intensification of global health challenges but also highlight the diversity and complexity of different regions in addressing these challenges. At the regional level, South Asia saw a significant increase in death rates, from 14,238 (95%UI 10,767 to 17,766) to 43,580 (95%UI 33,263 to 55,429), Southeast Asia, East Asia, and Oceania experienced a notable rise in DALYs, from 1,875,328 (95%UI 1,562,765 to 2,208,013) to 6,730,205 (95%UI 6,232,881 to 7,280,394), prevalence in South Asia also increased significantly, from 7,773,790 (95%UI 7,165,250 to 8,385,000) to 20,008,090 (95%UI 18,455,882 to 21,496,060), and Sub-Saharan Africa had a marked increase in incidence, from 19,265 (95%UI 15,673 to 23,203) to 47,376 (95%UI 39,181 to 56,014). These figures reflect the diversity in health challenges and the complexity of response strategies across different regions(Table 1 ).
Generally, as SDI decreases, ASDR generally increases, and it also increases overall over the years. However, after 2010, the ASDR in high SDI regions became higher than in high-middle SDI regions, indicating a shift in the health burden. The trend for ASMR is similar to that of ASDR.In terms of ASPR, high-middle SDI is lower, while the other four SDIs are generally higher. Over time, there is a significant decline in high-middle SDI, while the other four groups show little change.Regarding ASIR, as SDI increases, ASDR generally increases, and it also gradually increases over the years.ASMR increased from 4.29 (3.55, 5.11) to 5.54 (4.68, 6.41) in global, with an EAPC of 0.97 (0.91, 1.03). Notably, the High SDI region experienced a marked rise from 2.4 (1.95, 2.86) to 4.09 (3.34, 4.71), with an EAPC of 2.23 (2.07, 2.39). The Central Europe, Eastern Europe, and Central Asia region showed a particularly sharp increase in mortality rates, with an EAPC of 1.61 (1.39, 1.83). Conversely, the Low SDI region exhibited a slight decrease in mortality rates, from 8.69 (7.03, 10.73) to 8.62 (7.09, 10.51), with an EAPC of -0.08 (-0.2, 0.04).ASDR increased from 107.77 (91.26, 126.92) in 1990 to 128.41 (109.14, 145.64) in 2021, with an EAPC of 0.63 (0.58, 0.67). The High SDI region showed a significant rise, with DALYs rates increasing from 54.18 (46.63, 61.64) to 84.75 (74.6, 94.25), and an EAPC of 1.83 (1.71, 1.95). The Low SDI region, however, demonstrated a decrease, with DALYs rates dropping from 191.83 (156.62, 233.69) to 181.48 (150, 219.11), and an EAPC of -0.29 (-0.38, -0.19). ASPR generally showed a downward trend. Globally, prevalence rates decreased from 310.68 (289.07, 333.84) to 291.19 (272.49, 311.88), with an EAPC of -0.16 (-0.18, -0.13). The High-middle SDI region stood out with a significant decrease in prevalence, from 283.65 (264.47, 305.48) to 246.07 (229.28, 263.95), and an EAPC of -0.37 (-0.41, -0.33). The Southeast Asia, East Asia, and Oceania region experienced a substantial decline in prevalence rates, with an EAPC of -0.4 (-0.49, -0.32).ASIR mostly increased across the board. Globally, incidence rates rose from 12.24 (11.31, 13.33) to 14.97 (14.02, 15.93), with an EAPC of 0.66 (0.66, 0.67). The High SDI region saw a moderate increase, with incidence rates climbing from 16.83 (15.57, 18.35) to 18.85 (17.6, 20.1), and an EAPC of 0.34 (0.3, 0.38). The North Africa and Middle East region, however, had the most significant increase in incidence rates, from 15.77 (14.36, 17.27) to 25.72 (23.77, 27.66), with an EAPC of 1.55 (1.47, 1.62).
( Fig. 1 and Fig. 2 )
The figure displays the relationship between mortality and the SDI for various global regions from 1990–2021, illustrating regional disparities in health outcomes over time.The figure illustrates a general downwards trend in ASDR and ASMR as the SDI increased from 1990–2021. However, between SDIs of 0.35 and 0.6 and above an SDI of 0.8, there is a rebound in ASDR and ASMR. This suggests that despite overall improvements in health outcomes, certain regions or countries with moderate to high SDI face challenges in reducing the burden of CKD.
3.3 Risk Factors for CKD Due to Hypertension
In the data from both 1990 and 2021 globally, high systolic blood pressure and kidney dysfunction have consistently been the leading risk factors for death. In 1990, high systolic blood pressure accounted for 24.61% of total deaths among males and 26.16% among females worldwide, while kidney dysfunction represented 36.01% and 35.34% respectively. By 2021, high systolic blood pressure constituted 26.55% of total deaths among females and 25.36% among males globally, with kidney dysfunction's impact being 32.52% for females and 33.06% for males. Additionally, the influence of high body-mass index significantly rose in high SDI areas, representing 16.09% and 16.26% of total deaths among females and males in 2021, a proportion lower in 1990. Dietary factors, including high sodium intake and low intake of fruits and vegetables, impacted both years, but their influence was intensified in 2021, especially in high SDI regions. Environmental factors, such as the effects of high and low temperatures, were relatively minor in 1990 but showed an increase by 2021. In low SDI areas, kidney dysfunction and high systolic blood pressure continue to dominate, reflecting disparities in medical resources and health awareness. These data indicate that lifestyle and environmental factors are increasingly affecting global health, while high systolic blood pressure and kidney dysfunction persist as major risk factors for mortality.
Risk factors contributed to DALYs for the years 2021 and 1990 shows that high systolic blood pressure and kidney dysfunction have consistently been leading factors (Fig. 3).
For instance, in 2021, high systolic blood pressure accounted for 24.94% and 25.66% of DALYs in males and females globally, respectively, while kidney dysfunction had an impact of 34.16% and 33.51%. The impact of high Body Mass Index (BMI) significantly rose in high SDI regions, contributing to 12.53% and 14.23% of DALYs in males and females in 2021, respectively. Dietary factors, such as high sodium intake and low consumption of fruits and vegetables, were significant in both years but saw an increase in impact by 2021. Environmental factors like heat and cold also showed increased impacts. In low SDI regions, the impact of kidney dysfunction and high systolic blood pressure remained dominant, reflecting differences in medical resources and health awareness. Obesity and diabetes are particularly severe issues in high SDI regions, emphasizing the need for healthy diets and physical activity.
Risk factors in different region have their own features[15–17],both global perspective and specific view should be taken to look deep into the sight.
3.4 Decomposition Analysis
Decomposition Analysis on 21GBD regions shows significant features(Fig. 4).
The global overall difference in DALYs is significant, with South Asia showing significant contributions from aging and population growth. East Asia has a significant negative impact from epidemiological changes on DALYs, accounting for − 82.79%, which may reflect improvements in disease control and health management in the region. In terms of the number of deaths, the global overall difference is also significant, with East Asia showing a significant positive contribution from aging, while Central Africa has a relatively small impact from aging on the number of deaths, but a significant contribution from population growth. The global overall difference in prevalence is huge, with South Asia leading at 1,223,429 people, with aging and population growth contributing 31.38% and 77.70%, respectively. East Asia has a very high contribution from aging to prevalence, reaching 99.74%, while epidemiological changes have a significant negative impact, accounting for − 49.59%. The global overall difference in incidence is highest in East Asia, at 81,008.84 people, with aging and population growth accounting for 56.15% and 27.39%, respectively. Central America and the Caribbean have a contribution of 32.96% from aging to incidence, 43.27% from population growth, and a significant impact from epidemiological changes, accounting for 23.77%. Changes in the global health burden reveal significant differences between regions, especially in High-income North America and High-income Asia Pacific. In High-income North America, aging and population growth contribute about 19% and 24%, respectively, to the overall increase in DALYs, while the impact of epidemiological changes is as high as 56%, which may be closely related to the increase in chronic and non-communicable diseases. In contrast, in High-income Asia Pacific, the impact of aging on the increase in DALYs is extremely significant, reaching 116%, although the contribution of population growth is lower, at 23%, but epidemiological changes are negative, reducing by 38%, indicating that the region has achieved results in controlling certain diseases.
East Asia shows some unique characteristics and advantages in health indicators: in terms of mortality, aging has a very high positive impact on the number of deaths, showing a clear trend of population aging in the region; while in DALYs, although aging and population growth have significant positive contributions to the health burden, epidemiological changes show a very negative impact (-82.79%), which may indicate that East Asia has made positive progress in disease prevention and control; in terms of prevalence, the impact of aging and population growth is significant, but the negative impact of epidemiological changes is particularly significant (-49.59%), reflecting the region's success in improving public health and disease management; in terms of incidence, East Asia also shows significant impacts of aging and population growth, while the impact of epidemiological changes is positive, indicating that the region has also achieved results in reducing the incidence of new cases. These characteristics and advantages may be related to investments in public health policies, healthcare systems, and health promotion activities in East Asia, which help to improve the health level and quality of life of residents.