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The correlation between healthy lifestyle habits and all-cause and cardiovascular mortality in Guangxi

Abstract

Background

Adherence to healthy lifestyle habits has become a mainstream approach for lessening the burden of cardiovascular disease (CVD) during initial prevention efforts. The purpose of this study was to investigate the prevalence of four healthy lifestyle habits, the associated factors, and their impact on all-cause and cardiovascular mortality among residents of Guangxi Zhuang Autonomous Region.

Methods

From 2015 to 2019, individuals between the ages of 35 and 75 from Guangxi Zhuang Autonomous Region were recruited through the ChinaHeart Million Person Project. Our study examined four healthy lifestyle habits: not smoking, no or moderate amounts of alcohol, sufficient leisure time physical activity (LTPA) and a balanced diet.

Results

Out of the 19,969 individuals involved, the majority, 77.3% did not smoke, while 96.7% had limited alcohol intake, 24.5% engaged in sufficient LTPA, 5.5% followed a balanced diet, and merely 1.7% adhered to all four healthy lifestyle habits. Participants who were women, older, nonfarmers, living in cities, with a high income or level of education, or had hypertension or diabetes were more likely to follow all four healthy lifestyle habits (p < 0.001). People who followed the three healthy lifestyle habits had reduced chances of death from all cause (HR 0.34[95% CI:0.15,0.76]) and cardiovascular-related death (HR 0.23 [95% CI: 0.07, 0.68]) (p < 0.01) over a median period of 3.5 years.

Conclusions

In Guangxi Province, the level of adherence to healthy lifestyle habits is very minimal. Therefore, population-specific health promotion strategies are urgently needed.

Peer Review reports

Introduction

China has a substantial population burden of cardiovascular risk factors, with only 0.2% of Chinese adults achieving ideal cardiovascular health [1]. CVD has become the primary disease that threatens the health of Chinese residents, leading in mortality rates across both urban and rural populations and represent a critical issue in the nation’s public health landscape [2]. Currently, the prevalence of CVD in China is on the rise, it is estimated that there are currently 330 million people with CVD, and a turning point for the decline in cardiovascular health burden has not yet occurred [2]. Furthermore, In 2021, the proportion of the population in China aged 65 and above was 14.2%. It is projected that by 2050, the population aged 65 and above in China will reach 395 million, equivalent to 1.2 times the current population of the United States [3], it will further exacerbate this burden on China’s health care system. The World Bank reports that without the adoption of impactful management strategies, a sharp surge in the prevalence of cardiovascular cases is anticipated between the years 2010 to 2030. The hospitalization rates for CVD in China have experienced significant increase over the past three decades. Although several diagnostic and treatment technologies for CVD have reached or approached global standards, it is important to recognize that substantial progress only in the areas of detection and therapeutic methods will not sufficiently reduce the impact of CVD in China. Instead, efforts should focus on improving major modifiable risk factors as part of current strategies for preventing CVD [4].

Prior studies have consistently shown that adopting a lifestyle with low-risk habits positively influences the initial avoidance of chronic diseases and promotes long-term health [5], including nonsmoking, a healthy diet, adequate physical activity and maintaining an optimal body weight, which may offer greater efficacy in mitigating the likelihood of cardiovascular ailments, diabetes, and cancer than relying on a single element [6,7,8]. A multi-national longitudinal investigation has shown that maintaining a health-conscious lifestyle is linked to a lower frequency and death rate from cancer in general, along with a diminished risk for specific cancer forms among those with diabetes [9]. Individuals who followed the most wholesome lifestyles experienced relative reductions of 55%, 58%, and 62% in overall mortality, mortality attributed to CVD, and the onset of CVD, respectively, compared to those adhering to the least healthful lifestyles [10]. In addition, the China Kadoorie Biobank (CKB) study showed that at age 30, males who adopt a low-risk lifestyle live 8.8 years longer than men who do not adopt a low-risk lifestyle, and females live 8.1 years longer, which is mainly due to lower death rate from long-term respiratory system disorders, malignancies and long-term respiratory system disorders [11].

The Guangxi Zhuang Autonomous Region is a region with a large population of ethnic minorities and is economically disadvantaged. In the year 2016, non-communicable diseases were the leading contributors to mortality in Guangxi, constituting 80% of all deaths. Specifically, cardiovascular conditions, cancer, and cardiovascular-related diseases were identified as the primary determinants of mortality in the region [12]. In the past, surveys on the health behaviour of Guangxi residents were limited to the analysis of a single or isolated healthy lifestyle [13, 14] or the exploration of national health literacy [15]. To date, there has been no relevant discussion on the situation of Guangxi residents adhering to a comprehensive healthy lifestyle habits and its association with all-cause death and cardiovascular-related death. To fill this study gap, we conducted a broad-based cohort study in Guangxi. The goal was to assess the prevalence of four healthy lifestyle habits: not smoking, no or moderate amounts of alcohol, sufficient LTPA and a balanced diet among residents in Guangxi and to assess the degree of clustering and the existence of dependencies with personal characteristics. Additionally, we aimed to further explore whether there are correlations between the four healthy lifestyles and the risks of all-cause and cardiovascular mortality.

Methods

Study design and participants

The ChinaHEART is a government-backed initiative focused on screening and managing individuals at high-risk of CVD. The project plan was released in January 2016 [16]. Briefly, the project sampled 8 sites (Nanning, Wuming District, Hengzhou District, Liuzhou, Liujiang District, Qinzhou, Baize and Hezhou), including 3 rural areas and 5 urban areas. Residents age ranges from 35 to 75 years, who had been residents of the area for a minimum of six months and in the previous year were invited to take part in this study. Participants enrolled in the study with project ID numbers 1, 3, 5, or 7 were selected at random to represent the entire group and provide in-depth information on CVD.

Approval for the study protocol was granted by the Ethics Committees of Fuwai Hospital in Beijing, China (Approval No. 2014–574). Written informed consent was obtained from all enrolled participants.

From the Cox regression analysis, to prevent reverse causality and enhance the internal validity of our study, we omitted participants with a self-reported history of CVD (n = 689). The participant recruitment and screening process is presented in Fig. 1.

Fig. 1
figure 1

The flowchart of the study population selection. MPP: The Million Persons Project in China focuses on evaluating cardiac events with a patient-centered approach; CVD: Cardiovascular disease

Data collection and variables

The project used standardized face-to-face electronic questionnaires to collect data about four healthy lifestyle habits, including smoking, alcohol consumption, LTPA and diet. We briefly asked about participants’ smoking status, whether they were never, former, or current smokers. Those with a smoking history were also asked about their smoking habit, such as how often they smoked, what type of cigarettes they used, and how much tobacco they consumed daily. Former smokers were also questioned regarding the reasons behind their decision to stop smoking. In terms of drinking, participants were inquired about how often they consumed alcohol (never, monthly or less, 2–4 times a month, 2–3 times a week, or over 4 times a week). Former drinkers were asked about their typical alcohol consumption on a regular drinking day, which was used to calculate the average daily alcohol intake. LTPA was measured based on the common forms of physical activity at various levels of intensity (such as swimming, jogging, or high-intensity aerobic workouts; playing sports, walking, doing gymnastics, folk dancing, Tai-chi, Qigong, or other activities considered moderate-intensity), as well as the frequency and duration of exercise per week. A survey measuring the frequency of consumption in 12 food categories over the previous year was conducted using a qualitative food frequency questionnaire. The survey provided five choices for how often each food category was consumed, including daily, 1–3 times per week, 1–3 times per month, and rarely or never. A digital questionnaire equipped with real-time data validation checks was utilized to safeguard the accuracy and comprehensiveness of the collected interview information.

The healthy lifestyle habits category in terms of smoking was described as individuals who were nonsmokers (those who had never smoked or had quit smoking) [17]. The group of individuals with no or moderate amounts of alcohol (either never drinkers or those who consumed no more than 25 g [for males] or 15 g [for females] per day on average [18]). Participants in the sufficient LTPA category engaged in a minimum of 150 min of moderate-intensity aerobic exercise or 75 min of vigorous-intensity aerobic exercise each week; additionally, the acceptable diet group (score ≥ 4) followed the Chinese dietary recommendations and findings from prior research [18,19,20,21]. The balanced diet score was calculated based on the weekly consumption of six food groups, consisting of daily consumption of fresh fruits, fresh veggies, whole grains, fish and other sea creatures at least once a week, legumes and legume products at least four times a week, and restricting red meat intake to fewer than seven days per week. Individuals meeting the requirements for each nutritional group were assigned a score of 1; those who did not meet the criteria received a score of 0, resulting in a total healthy eating score of 6. The healthy group was defined as those with a score ≥ 4 [19, 20].

Information regarding the sociodemographic characteristics of the participants, such as gender, age, job, level of education, income, marital status, and health insurance status, in addition to urban living conditions and medical history, including self-reported conditions like high blood pressure, diabetes, and cardiovascular events such as myocardial or stroke, was gathered through electronic surveys.

Ascertainment of outcomes

The study assessed the subjects’ survival status using the National Cause of Death Surveillance System and Cause of Death Registration and Reporting System operated by the Chinese CDC. The study utilized the International Classification of Diseases (ICD)-10 to code all events, with a focus on cardiovascular death (ICD-10: I01-I99) and all cause mortality outcomes. At the time of the analysis, mortality data were available through December 31, 2019. As a result, all subsequent observations in our research were concluded by this specific date or the date of passing, whichever came first.

Statistical analysis

The characteristics and prevalence of the four healthy lifestyle habits among all subjects were outlined with categorical data shown as frequencies and percentages, and continuous variables shown as P values or medians with interquartile ranges. When the P value was less than 0.05, it indicated a small difference between males and females as well as rural and urban residents. Linear trends were tested using the Mantel-Haynes test and simple linear regression.

The study utilized multivariate regression models to explore the connections between personal traits and compliance with four healthy lifestyle habits, including factors like gender, age, job, schooling, income, marital status, and health insurance, along with medical background such as self-reported high blood pressure or diabetes, as well as cardiovascular events like heart attacks or strokes. For each healthy lifestyle habit that was assessed, we simultaneously adjusted for the other three lifestyles in our model. In Table 3, the correlation of the four healthy lifestyle habits and personal characteristics is displayed. Fisher’s Z-transformation was utilized to convert the diversity in correlation coefficients observed between rural and urban regions.

Cox proportional hazards models were utilized to calculate hazard ratios for cardiovascular-related death and all cause, adjusting for age and sex in multivariable models. The estimates were accompanied by 95% confidence intervals. The comprehensive model accounted for various demographic and socioeconomic factors, such as gender, age, job, schooling, yearly household earnings, marital status, and coverage under social health insurance. A sensitivity analysis was performed, excluding fatalities that happened during the initial six-month period. Additionally, a separate sensitivity analysis was carried out to omit participants who reported having hypertension or diabetes.

Statistical analyses were conducted using SAS 9.4 from SAS Institute in Kaili City, North Carolina, and R3.6.2 from Foundation for Statistical Computing in Vienna, Austria.

Results

Characteristics of participants and prevalence of healthy lifestyle habits

The study consisted of 19,969 individuals, with an average age of 55.3 ± 9.9 years; 62% were women, 41.4% resided in rural regions, 34.3% had completed high school or higher education, 42.6% worked as farmers, 23.2% had a yearly household income exceeding 50,000 yuan, 95% were married, and 98.5% had medical insurance coverage. Out of all the individuals involved, 19.3% reported having hypertension or diabetes, while 3.5% had previously experienced cardiovascular disease (Table 1).

Table 1 Participant characteristics by number of healthy lifestyle habits

Based on data from the 2010 national census, adjusted for age and gender, the greatest level of adherence was seen in the group with no or moderate amounts of alcohol (96.7%), with nonsmokers coming in second (77.3%). Conversely, lower rates of compliance were noted for sufficient LTPA (24.5%) and a balanced diet (5.5%), as detailed in Table 2. Just 1.7% of the total participants followed all four healthy lifestyle habits.

Table 2 Participants’ adherence to healthy lifestyle habits, overall, by gender and by urbanicity

Variations in adherence to healthy lifestyle habits

Women showed greater adherence to the four healthy lifestyle habits than men (all p < 0.001). In terms of the three healthy lifestyles of non-smoker, sufficient LTPA, a balanced diet, after standardization, urban dwellers demonstrated a higher level of adherence than rural inhabitants (all p < 0.0001); however, with no or moderate amounts of alcohol, rural residents had a greater rate of adherence than did urban residents (p < 0.0001). Additionally, women had a higher balanced diet compared to men (p < 0.0001), with a higher proportion of women consuming fruits, vegetables, and grains daily; beans at least 4 days a week; fish at least once a week; and red meat less than 7 days a week compared to men (all p < 0.05). Urban residents had higher dietary scores compared to rural residents (p < 0.0001), with higher daily consumption rates of fruits, vegetables, and grains, as well as legumes at least 4 days a week, and fish at least 1 day a week (all p < 0.0001). However, rural residents (28.5%) had greater percentages of people eating red meat < 7 days weekly than did urban residents (12.5%) (p < 0.0001). Women had a higher standardized adherence rate to two or more healthy lifestyle habits (99.6%) compared to men (63.4%) (p < 0.0001), while urban residents had a higher standardized adherence rate to three or more healthy lifestyle habits (33.7%) compared to rural residents (6.9%) (p < 0.0001) (Table 2) in relation to integrated healthy lifestyle habits.

Factors linked to four healthy lifestyle habits

The multivariate logistic regression analysis revealed that personal characteristics were linked to the four healthy lifestyle habits in various ways, with higher household income showing a negative connection to no or moderate amounts of alcohol and a balanced diet, but a positive correlation with adherence to the remaining two healthy behaviors. In general, women, older people, nonfarmers, individuals with higher levels of education, and urban dwellers were more inclined to adhere to all four healthy lifestyle habits (p < 0.0001) (Table 3).

Table 3 Participants characteristics associated with adherence to four healthy lifestyle habits

The correlation between health outcomes and four healthy lifestyle habits

The analysis included 19,969 participants, with a median follow-up of 3.53 years (IQR 1.60–3.68). There was a total of 236 deaths from all cause and 95 deaths from cardiovascular-related. After considering healthy lifestyle habits, there was a significant, inverse, and linear relationship between the number of healthy lifestyle habits and the risk of all-cause and cardiovascular mortality (p < 0.05). After adjusting for age and gender, people who followed three healthy lifestyle habits had significantly lower risks of death from all-cause mortality (HR 0.43 [95% CI: 0.19, 0.99]) and cardiovascular mortality (HR 0.28 [95% CI: 0.09, 0.87]) compared to those who did not follow any healthy habit (p < 0.05) (Table 4).

Table 4 Hazard ratios for all-cause and cardiovascular mortality

A single healthy lifestyle habit Cox regression model showed evidence of a low risk of death for nonsmokers for all cause mortality (HR 0.55 [95% CI: 0.39, 0.78]) and cardiovascular-related death (HR 0.49 [95% CI: 0.29, 0.84]) after adjustments for age and gender. Nevertheless, when it came to no or moderate amounts of alcohol, there was no clear evidence of a lower risk of all cause (HR 1.18 [95% CI 0.61, 2.26]) or cardiovascular-related death (HR 1.20 [95% CI 0.43, 3.36]) after multivariable adjustment. The adjustments resulted in nearly identical HRs for cardiovascular mortality as for all-cause mortality.

Discussion

In this study, we analysed the healthy lifestyle habits of the residents in Guangxi Province by utilizing data collected through the ChinaHEART Program in Guangxi. We found that only 1 out of 58 residents in Guangxi adhered to all four healthy lifestyle habits, which was lower than the national average [22].

Among the four healthy lifestyle habits, balanced diet adherence was the lowest, followed by sufficient LTPA, which is consistent with other studies [1, 23, 24]; moreover, the low proportion of balanced diets was the main reason for the very low proportion of comprehensive healthy lifestyle habit adherence. The 2010 Global Burden of Disease Study revealed that joint dietary risks constituted 10% of the worldwide disease burden [25]. According to China’s Pathway to Health in Ageing, it is proposed that overnutrition and undernutrition coexist in older Chinese adults [26]. The 2009 China Health and Nutrition Survey (CHNS) highlighted issues with diet quality and imbalances among senior adults, noting an overconsumption of grains, oils, and salt, alongside significant to severe insufficiencies in the intake of fish, vegetables, fruits, milk, and soy products [27]. The results of a previous survey on healthy lifestyles of the whole population in Guangxi’s chronic disease demonstration area showed that balanced diets were associated with the highest rate of knowledge of healthy lifestyles [13], thus suggesting that although the knowledge rate of healthy diets was high, the rate of healthy dietary behaviours was too low. Additionally, the timing of the survey administration in this research may have been connected to the brief interval preceding the initiation of the chronic disease demonstration project in Guangxi (2011). The CKB study indicated that overall physical activity (including work-related, commuting, household, and leisure-time activities) influences the trajectory of cardiometabolic disease development, thereby implying a broad health benefit associated with engaging in physical activity [28]. Furthermore, individuals who were not very active during most of their adult years but started being more physically active in their late adulthood (ages 40–61) experienced reduced risks of all-cause mortality, as well as lower rates of cardiovascular-related and cancer-related deaths [29]. This indicates that beginning physical activity in midlife can still be beneficial. Therefore, physical activity counselling should be a routine part of health care visits [17].

Men, younger people, farmers, people with a low education level and rural residents had lower adherence rates to the four healthy lifestyle habits. Principal risk factors for men encompassed tobacco use and high alcohol intake, while the increased adherence to healthful lifestyles among older individuals might be attributed to sufficient engagement in LTPA. Higher education is likely to enhance the well-being and quality of life for seniors. The findings from eight synchronized groups in various countries, including the US, UK, Spain, Europe, Australia, Japan, Korea, and Mexico, which are part of the Healthy Ageing Trajectories Study, indicate that initial educational experiences can significantly impact the health and capabilities of seniors [30]. Research on the impact of educational inequality on mortality indicates that individuals who have achieved higher levels of education tend to adopt healthier lifestyles [31]. China’s urban‒rural education inequality and urban‒rural development imbalance problems have led to the low educational attainment of farmers and rural residents. Data from the UK Biobank revealed that individuals with lower socioeconomic positions and poor lifestyle choices faced the greatest threats from death and heart disease [32], thus emphasizing the critical need for lifestyle improvements to mitigate health issues, particularly for those in lower socioeconomic groups.

Prior research has indicated that adopting a comprehensive healthy lifestyle in Chinese communities may yield similar health advantages as seen in Western communities. A meta-analysis including fifteen longitudinal investigations of Western subjects (n = 531,804 participants) with an average observation period of approximately 13.24 years demonstrated a decline in the relative risk of mortality for each additional healthy lifestyle element incorporated, thus indicating that embracing a minimum of four healthy lifestyle factors could lead to a 66% reduction in the likelihood of all-cause mortality [33]. Another meta-analysis demonstrated a significant dose‒response effect between adherence to a healthy lifestyle and CVD risk [34]. Moreover, CKB et al. reported that participants who followed a combination of multiple health lifestyle habits had a much lower total mortality risk [19]. Our study did not find a significant association between moderate alcohol intake and the risk of all-cause mortality, which differs from the results of the CKB. The inverse relationship could be attributed to the brief duration of the follow-up [22] or the possibility of reverse causation. Nevertheless, the strong correlation between various healthy lifestyle habits and health outcomes was notable. A strong negative correlation was found between the number of healthy lifestyle habits and the likelihood of mortality. These results align with prior investigations [7, 19] and could be associated with the pattern of adopting multiple healthy lifestyle habits.

Strengths and limitation of this study

This study is the first large-scale epidemiologic survey in Guangxi, with findings that could impact policies related to the prevention and control of chronic diseases in the region. Special focus should be placed on vulnerable groups, such as individuals with limited education and income or those residing in rural areas, in addition to health promotion initiatives aimed at the overall adult population in Guangxi. In Guangxi, a region with lower economic levels, health promotion strategies should be customized to fit the local economic conditions and prioritize addressing prevalent health issues. Furthermore, the lack of adherence to the Chinese Dietary Guidelines for Adequate Physical Activity or Diet by many people indicates that implementing integrated health interventions, such as diet and exercise counselling, could be a more effective approach to enhancing the overall population’s commitment to healthy lifestyle habits.

However, due to the fact that lifestyle habits were self-reported, recall bias was unavoidable, despite the use of a standardized questionnaire. Furthermore, this research assessed solely the occurrence of various food groups, without considering the specific kinds and serving sizes, and failed to account for total caloric consumption. Secondly, despite incorporating the majority of demographic and socioeconomic factors into the multivariate analysis, the possibility of reverse causality and remaining confounding influenced by unmeasured or unidentified elements cannot be entirely dismissed. Furthermore, even though the NMMS and vital registration cover both urban and rural regions in Guangxi, some death records may still be missing, particularly in rural areas, despite efforts to register them after validation by local household registration bureaus. The brief monitoring of the participants could have resulted in a small underestimation of the potential influence of healthy habits on death rates. Fourth, the study population was not determined on the basis of a randomized sampling design, which may lead to misestimating regional averages and may lead to spurious associations [35]. Fifth, our study population was restricted to adults aged between 35 and 75 years. We recognize that the non-communicable diseases are affecting even younger populations; therefore the exclusion of this demography may limit the generalizability of our findings to the broader population. We propose that future research should consider extending the lower age limit to 18 years or younger, allowing for a more comprehensive understanding of lifestyle factors across a wider age spectrum and their impact on health outcomes. This study focused on four healthy lifestyle habits, but future research should delve deeper into other habits like sedentary habits, mental well-being, and lack of sleep.

Conclusions

Residents aged 35–75 in Guangxi are not meeting the desired level of healthy lifestyle behaviors. Key lifestyle factors like unbalanced diet and inadequate LTPA are outstanding problems that require targeted health intervention and guidance. Furthermore, variations exist among demographic categories like sex, age, and urban versus rural regions, emphasizing the importance of prioritizing targeted health education and promotion strategies in public health policy.

Data availability

The authors declare that all data supporting the findings of this study are available within the article and its supplementary information files.

Abbreviations

CVD:

Cardiovascular Diseases

LTPA:

Leisure Time Physical Activity

ChinaHEART:

China Health Evaluation and Risk Reduction through Nationwide Teamwork

China PEACE MPP:

China Patient Centred Evaluative Assessment of Cardiac Events Million Persons Project

CDC:

Centers for Disease Control and Prevention

ICD-10:

International Classification of Diseases 10th edition

IQR:

Interquartile Range

SMD:

Standardized Mean Differences

MI:

Myocardial Infarction

OR:

Odds Ratio

HR:

Hazard Ratio

CI:

Confidence Interval

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Acknowledgements

The authors would like to thank all the staff members who participated in this investigation for all their work in the design, implementation, data collection, analysis, and reporting of this study.

Funding

Funding for this project was provided by the Ministry of Finance of China and National Health and Family Planning Commission, the Guangxi Key Laboratory of Precision Medicine in Cardio-cerebrovascular Diseases Control and Prevention (22-035-18), Guangxi Clinical Research Center for Cardio-Cerebrovascular Diseases (AD17129014) and Guangxi Medical High-level Backbone Talents “139” Program (G201901006).

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Contributions

ZY Z, and WH: conceptualization, visualization; WH, LX M, LY: investigation, data collection. ML and LY: data analysis, writing, original draft preparation, methodology, software, and reviewing. All authors contributed to the article and approved the submitted version.

Corresponding authors

Correspondence to Hong Wen or Zhi-Yu Zeng.

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The project protocol was approved by the central ethics committee at Fuwai Hospital, Beijing, China (Approval No. 2014–574). Written informed consent was obtained from all enrolled participants.

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The authors declare no competing interests.

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Mai, LX., Liu, Y., Wen, H. et al. The correlation between healthy lifestyle habits and all-cause and cardiovascular mortality in Guangxi. BMC Public Health 24, 2226 (2024). https://doi.org/10.1186/s12889-024-19718-w

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