Kailuan Study Research Articles

Association of changes in metabolic syndrome with new-onset and progression of chronic kidney disease.

Metabolic syndrome (MetS) is an independent risk factor for new-onset and progression of chronic kidney disease (CKD). However, whether changes in MetS are associated with the new-onset CKD and its progression remains unknown. A total of 36,571 participants from the Kailuan Study were enrolled in this study, including 27,072 without CKD and 9499 with CKD at baseline. According to the changes of MetS, 4 groups were divided as follows: MetS-free group, MetS-recovered group, MetS-developed group, and MetS-persistent group. Cox regression models were used to explore the association of changes in MetS with new-onset and progression of CKD. During a median follow-up of 8.38 years, 3313 cases of new-onset CKD were identified in participants without CKD. Compared with the MetS-free group, the hazard ratio (HR) and 95% confidence interval (95% CI) for new-onset CKD in the MetS-recovered, MetS-developed and MetS-persistent groups was 1.34 (1.18-1.53), 1.46 (1.30-1.63) and 1.85 (1.69-2.02), respectively. Among 9499 participants with CKD, during a median follow-up of 8.18 years, a total of 2305 experienced CKD progression. Compared with the MetS-free group, the HR (95% CI) for CKD progression in each group were 1.05 (0.91-1.22), 1.34 (1.17-1.55) and 1.65 (1.49-1.83), respectively. Furthermore, the association between changes in MetS and new-onset CKD was stronger in younger and middle-aged participants (≤60 years old) compared with older participants. Developed MetS and persistent MetS were both risk factors for the new-onset and progression of CKD. Even with recovery from MetS, an association of MetS with kidney damage remained.

Neck circumference, waist-to-height ratio, Chinese visceral adiposity index and incident heart failure

BackgroundThe indicators of abdominal obesity have shown to be associated with a high risk of cardiovascular diseases (CVDs), even adjusted for body mass index (BMI). We aimed to investigate the association between neck circumference, waist-to-height ratio (WHtR), Chinese visceral adiposity index (CVAI) and incident heart failure (HF) in Chinese adults.MethodsThe current study included 86,546 participants from two independent cohorts: the Kailuan I study established in 2006 and the Kailuan study II established in 2008. Participants aged 18–80 years who were free of CVDs or cancer were recruited at baseline. The values of neck circumference, WHtR and CVAI were available in 2014. The trajectory analysis was conducted using repeated measures of WHtR and CVAI in the 2008, 2010, 2012 and 2014 surveys. The incident HF cases were identified via reviewing medical records by cardiologists.ResultsDuring a mean follow-up of 5.62 years, 724 incident HF cases were documented. The highest quartiles of neck circumference, WHtR and CVAI respectively, were significantly associated with a high risk of HF compared to the lowest quartiles of adiposity measures (neck circumference: HR:1.30, 95%CI: 1.03–1.65; WHtR: HR:1.49, 95%CI: 1.16–1.92; and CVAI: HR:1.98, 95%CI: 1.48–2.65). The combination of adiposity measures with BMI or metabolic abnormalities jointly predicted incident HF. Presence of hypertension and diabetes appeared to be the major mediators, accounting for ∼ 8.11–24.7% of the associations between three indicators of abdominal obesity and HF risk.ConclusionThe new indices of abdominal adiposity could help to identify those who were at a high risk of HF, especially in the presence of high BMI or metabolic abnormalities.

Associations between cardiac arrhythmias and cardiovascular disease incidence and all-cause mortality: the Kailuan study

AimsCardiac arrhythmia is a rising public health issue. The aim of this study was to determine the associations of atrial fibrillation (AF) and heart block with cardiovascular disease (CVD) incidence and all-cause mortality.Methods and resultsWe included 141,362 participants (mean age [49.3], 80.9% men) from the Kailuan study. Arrhythmias were diagnosed through a 12-lead electrocardiograph (ECG). Mortality and CVD events were ascertained through multiple sources, including a municipal social insurance institution, hospital records, death certificates, and regular active follow-ups. During a median follow-up of 12.5 years, 18,301 total deaths and 13,208 cases of CVD were documented. The multivariable-adjusted hazard ratios (HRs) with 95% confidence intervals (CIs) comparing participants with AF to those without arrhythmia were 1.76 (1.61–1.93) for all-cause mortality, 2.11 (1.86–2.39) for CVD, 3.99 (3.33–4.79) for heart failure, and 1.56 (1.30–1.90) for stroke. Further, comparing participants with heart block to those without arrhythmia, the multivariable-adjusted HRs (95% CIs) were 1.31 (1.24–1.38) for all-cause mortality, 1.26 (1.18–1.35) for CVD, 1.40 (1.23–1.59) for heart failure, and 1.25 (1.15–1.37) for stroke. Additionally, there were generally stronger associations for AF and heart block with all-cause mortality and CVD in younger participants compared with their older counterparts (Ps-interaction ≤ 0.02) and a stronger association between AF and CVD in women compared with men (Ps-interaction ≤ 0.006).ConclusionAF and heart block were associated with a higher risk of subsequent adverse CVD events and mortality. Our findings highlight the importance of strategies for preventing cardiac arrhythmias to reduce the risk of CVD and mortality.

The dynamic patterns of metabolic-associated fatty liver disease and its severity and risk of cardiovascular disease.

While metabolic-associated fatty liver disease (MAFLD) is widely recognized as a risk factor for cardiovascular disease (CVD), the connection between the dynamic patterns of severity of hepatic steatosis and the associated CVD risk remains uncertain. This study included 71,098 participants from the Kailuan Study without CVD or cancer who underwent two consecutive biennial health screenings between 2006 and 2008 and were followed up until 2022. MAFLD and its severity were assessed using ultrasound. Participants were categorized into four groups based on dynamic MAFLD patterns: MAFLD-free, MAFLD-progression, MAFLD-regression, and MAFLD-persistence. MAFLD-regression was further divided into regression from mild MAFLD and regression from moderate/severe MAFLD. Cox proportional hazard regression models analyzed the association between the progression and regression of MAFLD and CVD risk. After a mean follow-up of 12.63 ± 3.16years, 7838 individuals experienced incident CVD, 5374 had strokes, 1321 had myocardial infarctions, and 1819 developed heart failure. After adjusting for potential confounders, MAFLD-progression was associated with a higher CVD risk compared to MAFLD-free (HR 1.25, 95% CI 1.17-1.33), but this risk decreased with increasing age. Individuals with MAFLD-persistence had the highest CVD risk (HR 1.54, 95% CI 1.46-1.62). Compared to persistent MAFLD, regression from mild MAFLD was associated with a lower CVD risk (HR 0.83, 95% CI 0.76-0.91). The progression of MAFLD can increase the risk of CVD, while regression of MAFLD can decrease the risk of CVD. These findings suggest that the dynamic patterns of MAFLD significantly influence CVD risk.

Pathways from insulin resistance to incident cardiovascular disease: a Bayesian network analysis

BackgroundInsulin resistance coexist with many metabolic disorders, whether these disorders were promotors or pathway-factors for the association of insulin resistance and cardiovascular disease (CVD) remained unclear. We aimed to investigate the pathways related to elevated the triglyceride-glucose (TyG) index and pathways through elevated TyG index to the occurrence of CVD in Chinese adults.MethodsA total of 96,506 participants were enrolled from the Kailuan study. Bayesian network model with the max-min hill climbing algorithm and maximum likelihood estimation was applied to identify factors and pathways related to the TyG index, and quantitatively infer the impact of associated factors on elevated TyG index and the occurrence of CVD by computing conditional probabilities.ResultsA final Bayesian network was constructed with 14 nodes and 25 arcs, creating 28 pathways related to elevated TyG index and 8 pathways from elevated TyG index to CVD. Elevated TyG index was causally associated with CVD, the condition probability was 11.9%. Pathways to elevated TyG index were mainly through unhealthy lifestyles and the subsequent increase in lipid profiles, especially smoking and low-density lipoprotein cholesterol. The most important pathway from elevated TyG index to CVD was through overweight/obesity, hypertension, and chronic kidney disease, with a condition probability of 18.5%. The maximum relative change rate related to elevated TyG index was observed for overweight/obesity (64.3%).ConclusionsElevated TyG index was causally associated with the risk of CVD, a combined control of lifestyles and metabolic factors may contribute to the reduction of TyG index and the prevention of CVD.

Arterial stiffness is associated with new-onset chronic kidney disease.

Background: A potential independent association between arterial stiffness (AS) and the development of new-onset chronic kidney disease (CKD) has not been thoroughly examined. Patients and methods: A total of 6929 participants were collected from the Kailuan study. All participants were free of CKD at the baseline. The participants were divided into four groups based on their brachial-ankle pulse wave velocity (baPWV) values. Cox regression models were used to analyze the relationship between baPWV values and the risk of new-onset CKD. Results: Over the course of a 10.06-year follow-up period, a total of 962 cases of new-onset CKD were documented. Cox proportional hazards analyses showed that a higher baPWV quartile was linked to an increased risk of new-onset CKD. Conclusions: Brachial-ankle pulse wave velocity has a strong correlation with the development of new-onset CKD. Therefore, baPWV can be considered an innovative indicator for predicting the occurrence of new-onset CKD.

Sex- and metabolic-specific association between cumulative body mass index and incident chronic kidney disease: a prospective community-based cohort study

Background and AimDifference in metabolic status may cause inconsistent association between body mass index (BMI) and chronic kidney disease (CKD) in men and women. This study aimed to quantify sex-specific association between cumulative BMI (cumBMI) and incident CKD by different metabolic status. Methods and ResultsParticipants free of CKD from the Kailuan Study were followed biennially from baseline (June 2006 to October 2007) to December 2019. cumBMI was calculated by use of follow-up BMI and follow-up time and was divided into low weight (<18.5 kg/m2), normal weight (18.5 to 23.9 kg/m2), overweight (24 to 27.9 kg/m2), and obesity (≥28 kg/m2) according to Chinese criteria. Metabolic health was defined as the absence of hypertension, dyslipidemia, and diabetes at baseline. CKD was defined as having estimated glomerular filtration rate <60 mL/min/1.73m2. This study included 76984 participants, with a mean age of 50.0 ± 11.6 years and 80.0% of men. Overweight (HR=1.24, 95% CI: 1.16–1.31) and obesity (HR=1.94, 95% CI: 1.77–2.12) were associated with higher risk of incident CKD in men regardless of metabolic status. Corresponding population attributable risk percentages for overweight and obesity were 10.3% (95%CI: 7.1–12.9) and 12.7% (95%CI: 10.6–14.7), respectively. However, low weight (HR=1.56, 95% CI: 1.05–2.30) and obesity (HR=1.32, 95% CI: 1.01–1.73) were associated with higher risk of incident CKD in metabolically healthy women but not in metabolically unhealthy women. ConclusionsThis study demonstrated sex- and metabolic-specific associations between BMI and CKD occurrence and advocates an individualized weight management strategy.

Time in target range for systolic blood pressure and glucose with cardiovascular disease and all-cause mortality risks.

Evidence on the combined effect of time in the target range (TTR) for systolic blood pressure (SBP) and fasting blood glucose (FBG) in real-world settings was scarce. We aimed to evaluate the separate and combined effects of SBP TTR and FBG TTR on cardiovascular disease (CVD) and all-cause mortality risks among participants with comorbidity of hypertension and diabetes. The data was derived from the Kailuan study. The target ranges for SBP and FBG were set as 110-140 mmHg and 3.9-7.0 mmol/L, and linear interpolation to calculate TTR. Cox proportional hazard regression models were used to estimate the separate and combined effects of SBP TTR and FBG TTR on CVD and all-cause mortality risks. We included 11,899 participants with hypertension and diabetes comorbidity whose mean age was 54.52 ± 10.36 years, and 9,873 (83.00%) were male. After a follow-up of 6.67 years, 1,381 cases of CVD and 2,148 cases of all-cause mortality were documented. In the fully adjusted model, compared with the participants with both SBP TTR and FBG TTR lower than 25%, participants with both greater SBP TTR and FBG TTR had the lowest risks of CVD (HR: 0.53; 95%CI: 0.57-0.78) and mortality (HR: 0.59; 95%CI: 0.47-0.74). Per 1 SD increase in SBP TTR was associated with a 14% reduction in CVD risk (HR, 0.86; 95% CI, 0.80-0.92) and a 10% reduction in mortality risk (HR, 0.90; 95% CI, 0.85-0.95), all significant results were maintained in the FBG TTR analyses. Both higher SBP TTR and FBG TTR were associated with lower risks of CVD and all-cause mortality in participants with comorbidity of hypertension and diabetes. Simultaneous control of SBP and FBG within the target ranges is a beneficial strategy for CVD prevention.

Prospective Study of Sleep Talking and Risk of Stroke.

The potential clinical implication of sleep talking in relation to stroke has not been explored to date. This study aimed to prospectively examine the association between sleep talking and the risk of developing stroke in a community-based cohort. Included were 8001 participants (mean age, 54 years) of the Kailuan Study, China. Sleep talking was measured by a questionnaire in 2012. Cases of incident stroke were confirmed by review of medical records. Cox proportional hazards models were used to explore the association between sleep talking and stroke, adjusting for several sleep parameters (ie, insomnia, daytime sleepiness, sleep duration, snoring, and use of hypnotics) and other potential confounders. During 8 years of follow-up, 333 incident stroke cases were identified. Relative to participants without sleep talking at baseline, those with sleep talking had a higher risk of developing stroke (hazard ratio [HR], 1.30 [95% CI, 1.03-1.65]), adjusting for potential confounders. Compared with participants without probable rapid eye movement sleep behavior disorder and sleep talking, those with sleep talking and probable rapid eye movement sleep behavior disorder had a higher risk of stroke (adjusted HR, 1.93 [95% CI, 1.40-2.66]). The presence of sleep talking was associated with a higher risk of developing stroke. Future studies with cases of clinically confirmed sleep talking and a longer follow-up would be appropriate to further investigate this association.

Systolic Blood Pressure Time in Target Range and Cardiovascular Disease and Premature Death

BackgroundPrevious research has suggested that time-in-target range (TTR) for systolic blood pressure (SBP) was associated with adverse cardiovascular events, but real-world data studies remain limited. ObjectivesThe purpose of this study was to estimate the SBP-TTR associated with cardiovascular disease (CVD) and premature death among the employed individuals with hypertension. MethodsThis study included 9,552 participants from the workplace hypertension management program initiated by the Kailuan Study in 2009. TTR was calculated using linear interpolation with the target range of SBP between 120 and 140 mm Hg. Multivariable Cox regression was used to evaluate the HR and CI for the association among SBP-TTR and CVD, premature CVD, and premature death. ResultsParticipants with higher TTR exhibited a reduced number of cardiovascular risk factors. For a 1-SD increment in SBP-TTR, the HR was 0.81 (95% CI: 0.74-0.88) for CVD, 0.76 (95% CI: 0.67-0.86) for premature CVD, and 0.83 (95% CI: 0.74-0.92) for premature death. Furthermore, SBP-TTR was associated with a lower risk of ischemic stroke (HR: 0.81; 95% CI: 0.74-0.90) and hemorrhagic stroke (HR: 0.72; 95% CI: 0.56-0.93), but not myocardial infarction (HR: 0.84; 95% CI: 0.68-1.03). Results were similar when the target range of SBP was redefined as 110 to 130 mm Hg, but there was no significant association between SBP-TTR and hemorrhagic stroke (HR: 0.84; 95% CI: 0.64-1.10). ConclusionsSBP-TTR was associated with a decreased risk of CVD, premature CVD, and premature death among the employed individuals.

LE8 score in relation to cardiovascular disease and mortality in individuals with diabetes

Abstract Background Evidence regarding the potential health effects of Life’s Essential 8 (LE8) score among individuals with type 2 diabetes (T2D) is limited. Purpose We aimed to examine the associations of LE8 score with risk of cardiovascular disease (CVD) and mortality, among individuals with T2D. Methods We prospectively followed 19,915 Chinese participants with T2D at baseline or diagnosed during follow-up (Kailuan Study: 2006-2020), who were free of CVD at diagnosis of diabetes. Diet, lifestyle, and health conditions were repeatedly assessed every 2 years. The LE8 score (range, 0-100), was calculated based on 8 components: diet quality, physical activity, smoking status, sleep health, BMI, blood lipids, blood glucose, and blood pressure. We used time-varying cox models to model the associations. Results During a median follow-up of 11.5 years in participants with T2D, there were 3,295 incident CVD cases and 3,123 deaths. Higher LE8 score was associated with lower risk of CVD incidence and total mortality among participants with diabetes. The multivariate-adjusted hazard ratios and 95%CIs for the highest quintile of LE8 score compared with the lowest quintile were 0.56 (0.53, 0.59) for CVD incidence, 0.57 (0.53, 0.62) for heart disease incidence, 0.53 (0.49, 0.57) for stroke incidence, and 0.73 (0.69, 0.78) for total mortality (all p trend&amp;lt;0.001). Furthermore, compared with participants with stable or decreased LE8 score after diabetes diagnosis, those with increased LE8 score had 17%-42% lower risk of CVD incidence, heart disease incidence, stroke incidence, and total mortality. These associations persisted in subgroup analysis stratified by age, sex, BMI, smoking status, alcohol intake, family history of diabetes and CVD, and follow-up time. Conclusions Higher LE8 score was associated with a substantially lower risk of CVD incidence and total mortality among adults with T2D. These findings further support the tremendous benefit of adhering to a high CVH, defined as the LE8 in reducing the subsequent burden of cardiovascular complications and improving overall health in individuals with T2D.Main TableMain Figure

Independent associations of educational attainment and its joint associations with LE8 score for risk of cardiovascular disease incidence and mortality among Chinese people

Abstract Background/Introduction Educational attainment is a social determinant of health. Quantifying its associations with risk of cardiovascular disease (CVD) incidence and mortality has public health importance. Recently, the American Heart Association introduced the Life’s Essential 8 (LE8) score to evaluate CVD risk. However, it remains unclear how educational attainment and the LE8 score interact in their joint associations with CVD and mortality. Purpose To examine the associations of educational level with the incidence of CVD, including coronary heart disease (CHD) and stroke, and total mortality. Also, we examined the joint associations of educational level and the LE8 score with CVD incidence and total mortality. Methods We prospectively followed 91,744 Chinese adults from the Kailuan Study (2006-2021), who were free of CVD at baseline. Information on educational level, diet, lifestyle, and health conditions was collected every 2 years. LE8 score was calculated based on eight components: diet quality, physical activity, smoking status, sleep health, body mass index, blood lipids, blood glucose, and blood pressure. We used time-dependent Cox models to assess the associations of educational level with the outcomes as well as the joint associations of educational level and LE8 score, with adjustments for demographics, dietary and lifestyle factors, and medical history. Results During a mean follow-up of 13.1 years, there were 12,916 incident CVD cases and 13,090 deaths. Compared with the participants who only received illiteracy or elementary education, those who received high school education and above had a lower risk of CVD incidence (HR = 0.82, 95% CI = 0.76, 0.88), stroke incidence (0.72, (0.66, 0.79)), and total mortality (0.73, (0.68, 0.77)). Educational level was not associated with risk of CHD. Furthermore, significant additive interactions between educational attainment and LE8 score on the risk of CVD and mortality were observed (all p values for additive interactions &amp;lt;0.01). Compared with the participants who only received illiteracy or elementary education and had a low LE8 score, those who only received illiteracy or elementary education but had a high LE8 score still had a 27%-47% lower risk of CVD and total mortality, while those who received high school education and above and had a high LE8 score had a 51%-74% lower risk of CVD and total mortality. Conclusions Higher educational level was associated with a lower risk of CVD and mortality. These inverse associations were most apparent among participants with both a high educational level and a high LE8 score, while the participants with a low educational level but with a high LE8 score still had a significantly lower risk. These findings highlight the importance of improvement in educational attainment in preventing CVD events and deaths, and suggest that CVD events and deaths attributable to lower levels of education may be reduced by improving LE8 score.

Systolic blood pressure time in target range and cardiovascular disease and premature death

Abstract Background Time-in-target range (TTR) for systolic blood pressure (SBP) independently predicts cardiovascular outcomes. However, there are limited research based on real-world data. Purpose To estimate SBP-TTR associated with cardiovascular disease (CVD) and premature death among the employed individuals with hypertension. Methods This study is based on the Kailuan cohort. As part of the Kailuan study, a workplace-based hypertension management programme was initiated in 2009 for employed people with hypertension. The TTR was defined as 120 to 140 mmHg according to the current guidelines, and in the sensitivity analyses it was further defined as 110 to 130 mmHg. TTR was estimated over the first 6 months of follow-up using linear interpolation. The association between SBP-TTR with CVD, premature CVD and premature death was estimated using adjusted Cox proportional hazards regression models to adjust for multiple confounders. Results A total of 9552 hypertensive participants were included. A one standard deviation increase in SBP-TTR is associated with a 19% reduction in the risk of CVD (HR:0.81; 95%CI: 0.74 to 0.88), a 24% reduction in the risk of premature CVD (HR:0.76; 95%CI: 0.67 to 0.86), and a 17% reduction in the risk of premature death (HR:0.83; 95%CI: 0.74 to 0.92). When SBP-TTR is redefined as 110-130 mmHg, a one standard deviation increase in SBP-TTR is associated with a 23% reduction in the risk of CVD (HR:0.77; 95%CI: 0.70 to 0.84), a 30% reduction in the risk of premature CVD (HR:0.70; 95%CI: 0.60 to 0.81), and a 27% reduction in the risk of premature death (HR:0.73; 95%CI: 0.66 to 0.80). These associations were independent of SBP-mean and SBP-SD. Subgroup analysis results indicate that SBP-TTR contributes to a reduction in the risk of premature death in individuals with a high cardiovascular risk score. Conclusions SBP-TTR was statistically associated with a decreased risk of CVD, premature CVD and premature death. Intensifying blood pressure control measures can further increase cardiovascular benefits.

Association of impaired fasting glucose with cardiometabolic multimorbidity: TheKailuan study.

We investigated the association between impaired fasting glucose (IFG) and cardiometabolic multimorbidity (CMM) in the Chinese population. We included 119,368 participants, free of diabetes mellitus and cardiovascular disease, who participated in the health examination (2006, 2008, 2010) of the Kailuan Study. According to World Health Organization diagnostic criteria, participants were divided into normal fasting blood glucose (FBG) (<6.1 mmol/L) and IFG (FBG 6.1-6.9 mmol/L) groups. CMM was defined as having two or more cardiometabolic diseases, including myocardial infarction, stroke and diabetes mellitus. We used Cox proportional hazards models to evaluate associations between IFG and CMM. During a median follow-up period of 13.94 years, 2,432 CMM incident events occurred. After adjusting potential confounders, the hazard ratio (HR) and 95% confidence interval (CI) for CMM in the IFG group was 2.83 (95% CI 2.58-3.10) versus the normal FBG group. The HR of IFG for diabetes mellitus was 3.43 (95% CI 3.30-3.55), which was >1.25 (95% CI 1.13-1.37) for myocardial infarction, 1.16 (95% CI 1.07-1.25) for ischemic stroke and 1.06 (95% CI 0.88-1.27) for hemorrhagic stroke. Compared with normal FBG, HRs for risk of IFG for CMM were 2.73 (95% CI 2.48-3.02) in men and 3.86 (95% CI 2.92-5.09) in women. IFG was a risk factor for CMM. The effect of IFG on diabetes mellitus was stronger than that on other cardiometabolic diseases. The effects of IFG for CMM differed by sex.

In utero and childhood exposure to the great Chinese famine and risk of aging in adulthood

Background Early-life exposure to famine may influence the occurrence of chronic diseases and aging in midlife among those exposed. This study aims to explore the relationship between exposure to the Chinese Great Famine and aging in middle-aged individuals. Methods Participants born in 1963–1965 (unexposed), 1959–1961 (in utero exposure), and 1955–1957 (childhood exposure) from the Kailuan Study were included. Their biological age at 2010, 2014, and 2018 was investigated, and age acceleration (biological age minus actual age) was calculated to assess aging. Logistic regression analysis was employed to describe the relationship between famine exposure and the aging risk. Subgroup and sensitivity analysis were conducted to explore differences and stability in this relationship among different groups. Results A total of 17,543 participants were included in this study. Among them, 12,762 (72.7%) were male, and 4,781 (27.3%) were female, with 2,543 participants experiencing aging events. Compared to unexposed participants, those exposed during childhood and in utero exhibited a 1.69-fold (OR = 1.69, 95%CI: 1.53–1.87) and 1.22-fold (OR = 1.22, 95%CI: 1.08–1.37) increased risk of aging. Subgroup analysis revealed an interaction with income (P for interaction = 0.008), and additional interaction analysis suggested that increasing income could partially mitigate the detrimental effects of early-life famine exposure. Furthermore, experiencing famine in severely affected regions exacerbated the risk of aging (OR = 1.41, 95%CI: 1.21–1.63). Conclusion Exposure to famine in utero or during childhood may elevate the risk of midlife aging among exposed individuals, and these relationships are influenced by the severity of famine exposure. Increasing income may also help mitigate these effects.Trial registration: Kailuan study, ChiCTRTNRC11001489. Registered July 19, 2015 Retrospectively registered, https//www.chictr.org.cn/showprojEN.html?proj=8050&u_atoken=af46a0dee8d73f320bb5459ab7bbcfa9&u_asig=1a0c381017255295896468605e00cf .

Association of socioeconomic status and life’s essential 8 with cardiovascular diseases and all-cause mortality in north China: Kailuan study

BackgroundWe aimed to explore the association of socioeconomic status (SES) and life’s essential 8 (LE8) with cardiovascular disease (CVD) and all-cause mortality in north China.MethodsA total of 91,365 adults from the Kailuan study were included in this study. Comprehensive individual SES, mainly including monthly household income, education, Occupation position, and community environment, was confirmed by latent class analysis. Furthermore, the mediation and combination effects of SES and LE8 on CVD and all-cause mortality were further assessed. The Cox regression model was conducted to estimate HRs and 95% CI.ResultsDuring about 13 years of follow-up, 7,646 cardiovascular events and 11,749 deaths were recorded. Relative to the high SES, there were decreased risks of CVD [HR (95% CI): 1.57(1.43–1.72)] and high all-cause death [HR (95% CI): 1.43(1.31–1.53)] in the low SES. The associations between SES and CVD [Mediation % (95% CI): 22.3 (16.4–30.4)] and mortality [Mediation % (95% CI): 10.1 (7.1–14.0)] were partially mediated by LE8 when comparing medium SES to high SES. Meanwhile, relative to high LE8, the elevated risk of death [HR (95% CI): 1.72(1.56–1.89)], and incident CVD [HR (95% CI): 3.34(2.91–3.83)] were detected in low LE8. Compared to participants who had the high SES and LE8, participants who had both the low SES and LE8 further increased the risk of CVD [HR (95% CI): 7.76(5.21–11.55)] and all-cause mortality [HR (95% CI): 2.80(2.19–3.58)].ConclusionLow SES was related to a higher risk of CVD and mortality in low- and middle-income countries, which was partially mediated by LE8.

Serum uric acid trajectories and the risk of cardiovascular disease: a longitudinal association and pathway analysis.

Age-specifically longitudinal associations and potential pathways between serum uric acid (SUA) and cardiovascular disease (CVD) remained unclear. This study aimed to explore SUA trajectories in different age populations and to determine their associations and potential pathways with incident CVD. This prospective cohort included 41,367 participants from the Kailuan study, including 30,938 participants aged <55 years and 10,419 participants aged ≥55. The SUA trajectories during year 2006-2012 were identified by latent class growth models. Three SUA trajectories were identified in the overall, aged <55 and aged ≥55 years participants, as "low-stable" (51.9%, 54.4%, and 43.3%), "moderate-stable" (39.0%, 36.9%, and 45.6%), and "high-stable" (9.1%, 9.7%, and 11.1%), respectively. During a median follow-up of 6.75 years, incident CVD occurred in 2302 participants (5.56%). Overall, a high-stable trajectory was independently associated with a higher risk of CVD (hazard ratio [HR], 1.23; 95% [confidence interval], 1.06-1.42). Notably, the associations differed by age, a significant association was only observed in participants aged ≥55 years (HR, 1.29; 95% CI, 1.05-1.58), rather than those aged <55 years (HR, 1.08; 95% CI, 0.89-1.33). The addition of SUA trajectories to a baseline risk model for CVD improved the integrated discrimination improvement value (P < 0.05) and category-free net reclassification improvement value (P < 0.05). Bayesian network showed the conditional probability of high CVD risk associated with aging, elevated SUA trajectories, blood pressure, glucose, and inflammation was 15.5%. High-stable SUA trajectories were independently associated with an elevated risk of CVD, which is mainly induced by hypertension, diabetes, and inflammation, especially in participants aged ≥55 years.

Uric acid and risk of incident heart failure in individuals with cardiovascular disease

Background and aimsUric acid has been positively associated with the risk of developing heart failure in the general population. Nevertheless, it remains unclear whether hyperuricemia is an independent risk factor for heart failure and further contributes to the risk of heart failure among the already at-risk cardiovascular disease (CVD) population. This study aimed to evaluate the association between uric acid and incident heart failure in individuals with established CVD. Methods and resultsIncluded were 18,438 adults with established CVD but free of heart failure at baseline, from the Kailuan Study. Incident heart failure cases were ascertained by medical records. Cause-specific Cox proportional hazards regression models were applied to estimate hazard ratios (HRs) and 95 % confidence intervals (CIs) of heart failure according to uric acid tertiles. Over a median follow-up of 6.1 years, we identified 1215 incident heart failure cases. Higher uric acid was associated with a higher risk of incident heart failure, with adjusted HR for the last vs. first tertile of 1.50 (95%CI:1.30–1.73). Higher uric acid concentrations were associated with an increased risk of heart failure in individuals with coronary heart disease, atrial fibrillation, and ischemic stroke, but not in those with hemorrhagic stroke. Moreover, the observed association between uric acid and heart failure risk was more pronounced in individuals diagnosed with heart failure with reduced ejection fraction subtype compared with heart failure with preserved ejection fraction. ConclusionsIn individuals with CVD, uric acid was positively associated with the risk of heart failure, in a dose-response manner.

Remnant cholesterol is superior to other lipid-related parameters for the prediction of cardiometabolic disease risk in individuals with hypertension: The Kailuan study

BackgroundIt is uncertain which lipid-related parameter is most suitable for predicting the risk of cardiometabolic disease (CMD) in individuals with hypertension. AimsTo explore which lipid-related parameter is most suitable for predicting the risk of CMD. Methods and resultsWe studied 30,378 patients with hypertension who completed the 2006–2007 Kailuan health examination and followed up until December 31, 2021. In the constructed model, the utilities of lipid-related parameters for the prediction of CMD were compared using the C-index, NRI, and IDI. The best predictor (remnant cholesterol, RC) was identified and the participants were grouped according to RC quartile. Cox proportional hazard analysis was then used to evaluate the relationship between RC and the risk of CMD. During a median follow-up period of 14.7 years (IQR 5.3–15.1), 9502 (31.27 %) participants with hypertension developed CMD. The C-index, NRI, and IDI values for RC were higher than those for the other lipid parameters. After adjustment for multiple potential confounding factors, compared with the quartile (Q)1 RC group, the adjusted hazard ratios for CMD of the Q2–Q4 groups were 1.09 (1.03–1.16), 1.17 (1.11–1.24), and 1.25 (1.18–1.33) (P < 0.0001). Restrictive cubic spline analysis revealed dose-dependent relationships of lipid parameters with the risk of CMD. ConclusionsRC is superior to other lipid parameters for the prediction of the risk of CMD in individuals with hypertension. As the concentration of RC increases, the risk of CMD in such individuals also increases.

Association between body mass index combined with high-sensitivity C-reactive protein and the risk of postmenopausal breast cancer: A prospective cohort study.

The present study aimed to assess the risk of postmenopausal breast cancer in women based on a combination of body mass index (BMI) and high-sensitivity C-reactive protein (hs-CRP) levels. A total of 20,400 participants were investigated as part of the 'Kailuan Study' clinical trial. Participants were classified into four groups based on BMI (BMI ≥24 or <24 kg/m2) and hs-CRP level (hs-CRP ≥3 or <3 mg/l). Cox proportional hazards models were used to evaluate the association between the combination of BMI and hs-CRP and the risk of postmenopausal breast cancer. A total of 19,540 participants met the inclusion criteria. The median follow-up time was 14.97 years, with a cumulative follow-up period of 283,599.43 person-years. Among the participants, 269 individuals were diagnosed with postmenopausal breast cancer. Individuals with a high BMI (BMI ≥24 kg/m2) and a high hs-CRP level (hs-CRP ≥3 mg/) had a greater risk of postmenopausal breast cancer compared with individuals with a low BMI (BMI <24 kg/m2) and a low hs-CRP level (<3 mg/l) (hazard ratio, 1.75; 95% confidence interval, 1.25-2.47). The sensitivity analysis showed findings consistent with the primary results. In conclusion, the combination of high BMI and high hs-CRP level is associated with an increased risk of postmenopausal breast cancer. The present study is part of the Kailuan Study. Trial registration number: ChiCTRTNCR11001489 (Chinese Clinical Trial Registry, https://www.chictr.org.cn/showproj.html?proj=8050). Date of registration: 19/07/2015.