Associations of blood pressure with the factors among adults in jilin province: a cross-sectional study using quantile regression analysis

Associations of blood pressure with the factors among adults in jilin province: a cross-sectional study using quantile regression analysis

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ABSTRACT Hypertension has become a major public health challenge. However, numerous research results reported in the literature focus primarily on risk factors of hypertension, little is


known about how the whole continuum of blood pressure (BP) is associated with risk factors of hypertension. This study aims to reveal quantile-specific associations of BP with its risk


factors. A cross-sectional survey based on a sample of 23,050 adults aged 18 to 79 years was conducted in Jilin Province in 2012, and some subjects were excluded due to missing values in BP


or having BP control according to the purpose of this study. Quantile regression (QR) was employed to investigate the associations between systolic/diastolic blood pressure (SBP/DBP) and the


risk factors. The SBP and DBP in males presented statistically higher than females (_P_ < 0.001). High-salt diet for males manifested a slightly increasing positive association with


higher SBP only for high quantiles (≥70), but with a higher DBP for middle part of the quantiles (30~75), compared with bland diet. High-salt diet, drinking and high-density lipoprotein


cholesterol (HDL-C) were positively associated with BP measures in males. And the coefficient of total cholesterol (TC) in QR increased with BP in females who used to live in town. SIMILAR


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factor for cardiovascular disease (CVD), and has brought heavy economic burden to individuals, families, and society1,2,3,4. It is a great challenge for public health worldwide, because of


its high prevalence, which accounts for nearly half of the cardiovascular morbidity and mortality in the world5,6. In 2010, people died from hypertension approximately 2 million in China,


accounting for about 24.60% of total mortality7. Therefore, hypertension is an important public health problem that are supposed to be addressed urgently. At present, hypertension has become


a hot research spot8,9, where most of studies focused primarily on hypertension, including prevalence, influencing factors, and health problems in cross-sectional and cohort


studies10,11,12,13. Sun _et al_.’s findings suggested that waist circumference (WC) was an independent predictor of hypertension incidence10, and Zhang _et al_.’s prospective study suggested


that body mass index (BMI) dynamic gain may be related to incident hypertension for men of all ages and young and middle-aged women13. Generally, hypertension was viewed as a categorical


variable in these studies, but the incidence of hypertension is a chronic and continuous process. In other words, literatures about risk factors of hypertension have been mounting, yet there


is a little of publications on determinants of the normal parts of blood pressure (BP). Fortunately, quantile regression (QR) is not limited to explain the prevalence risk of hypertension.


What’s more, it could also be used to explain the risk of the BP at any point on its distribution. QR comprehensively shows heterogeneous changes in the dispersion of the relationship of


risk factors with BP continuum across its distribution. In addition, there is no distributional assumptions about the error term in QR model, thus, it enjoys high flexibility for modeling


data with heterogeneous conditional distributions14. In this study, we aimed mainly to investigate how the whole continuum of BP was associated with commonly researched influencing factors


of hypertension using QR model. Jilin Province is situated in the northeast of China (latitude 40°~46°, longitude 121°~131°), with a cold climate and different residential dietary


pattern1,15. Therefore, we could develop more effective prevention strategies for different BP populations, so as to achieve the purpose of “precision prevention”. RESULTS DESCRIPTIVE


CHARACTERISTICS OF PARTICIPANTS BY GENDER Table 1 shows the basic characteristics of the participants, where BMI, SBP, DBP, TG and FPG were all significantly higher in males than those in


females (_P_ < 0.05), but age, TC, LDL-C and HDL-C were just the opposite (_P_ < 0.05). And the proportions of demographics (drinking, smoking, hypertension, dyslipidemia and diabetes,


etc.) were significantly different between genders. As shown in Table 2, the distribution of BP and quantiles between males and females were different. Therefore, we separately identified


the factors for males and females by using QR model. QR STATISTICS BETWEEN THE BP MEASURES IN FEMALES Tables 3~4 show QR coefficients and 95% confidence intervals of the influencing factors


for BP in females. Age was positively associated with both SBP and DBP. Similarly, BMI, TG, TC and family history of CVD showed significantly positive associations with SBP/DBP across the


entire conditional BP distribution. Females who used to live in town were positively associated with a higher DBP/SBP for most of the quantiles (≥10). Undergraduate females were negatively


associated with SBP for most of the quantiles (≥20). Middle school females were negatively associated with SBP for part of the quantiles. Female manual labors and mental labors were


positively associated with a higher DBP for part of the quantiles, compared with unemployed and retired females. QR STATISTICS BETWEEN THE BP MEASURES IN MALES Tables 5~6 provide QR


coefficients and 95% confidence intervals of the influencing factors for BP in males. Similar to females, age, BMI, TG and family history of CVD presented positive associations with both BP


measures across the entire conditional BP distribution. Drinking showed positive associations with SBP/DBP. High-salt diet manifested a slightly increasing positive association with higher


SBP (quantiles ≥ 70), but with a higher DBP for middle part of the quantiles (30~75), compared with the bland diet. Undergraduate males were negatively associated with SBP for most of the


quantiles (≥20). Male manual labors and mental labors were positively associated with a higher DBP across the entire conditional DBP distribution compared with unemployed and retired males.


In addition, HDL-C also showed a positive association with SBP/DBP. In general, the quantiles of HDL-C among participants with hypertension were lower than those with normal BP in males


(Table 7). In contrast, the relationship changed in different BMI groups: the relationship remained the same in normal weight group, however, the quantiles of HDL-C among participants with


hypertension were higher than those with normal BP in underweight, overweight and obese groups. Further, the results of generalized additive models (GAM) showed that HDL-C performed


non-linear associations with both SBP (_F_ = 3.513, _P_ = 0.012) and DBP (_F_ = 7.388, _P_ < 0.001) (Fig. 1). DISCUSSION Hypertension has become a major public health problem in China7,


and a number of researchers have investigated the risk factors of hypertension5,16, but little is known about how the whole continuum of DBP and SBP is associated with commonly researched


influencing factors of hypertension. Measures in reducing the prevalence of hypertension in Jilin Province could be put forward after knowing the risk factors associated with BP. This study


explored the heterogeneity of the relationship of environmental and individual determinants with hypertension across the entire conditional distribution of BP measures using a QR model. It


was indicated that unhealthy eating habits was a predictor for higher BP measures in males, with a larger extent of the positive association at a higher quantile. Previous studies have


reported that BP was more prone to be elevated by alcohol drinking in males than in females17. In addition, it has been proven that high-salt diet was associated with BP18. Our results


showed that the high-salt was positively associated with BP only for the males, and the mechanism was probably correlated with estrogen and salt sensitivity. Estrogen affects the sodium


reabsorption and excretion via up regulation of NO production and different expression level of angiotensin receptors and ET receptors19. Therefore, males who maintain healthy lifestyle are


also likely to manage their BP better, and thereby have a lower risk of hypertension. Our study also investigated the effects of BMI and serum lipids on BP among adults. BMI showed a


positive association with BP in our study, which was consistent with the literature that obese people were more likely to be hypertensive compared with nonobese people20. Activation of the


renin–angiotensin system as well as physical compression of the kidney might be important factors in linking body weight and elevated BP21. Further, it has been proven that dyslipidemia was


associated with BP22. Our results showed that TG level was positively correlated with BP, and the mechanism was probably related with the insulin resistance23. Elevated TG level could make a


higher level of free fatty acids in serum, which would lead to insulin resistance, then insulin resistance further contributed to hyperinsulinemia, which might directly contribute to


elevation of BP by increasing renal sodium retention24. However, TC and HDL-C showed different associations with BP between males and females, which might be attributed to differences in sex


hormones, where estrogen was commonly believed to play an important role in lipolysis25. Moreover, HDL-C was positively associated with SBP/DBP in males, which was inconsistent with the


results in literature21,26. One possible reason was the nonlinear relationship between HDL-C and SBP/DBP, which showed a “U” shape that both too lower and too higher levels of HDL-C might


increase the risk of hypertension. Further, there might be an interaction between BMI and HDL-C, which showed that the HDL-C was higher among participants with hypertension than those with


normal BP in almost all BMI groups except those with normal BMI. Besides, other confounding risk factors27,28 that were not under our consideration might also have impacts on this


association. Furthermore, it has been proven that education was associated with hypertension29. Our results showed that education negatively associated with SBP. On one hand, the people with


higher level of education would have greater possibilities to engage in healthy lifestyles. On the other hand, older people were expected to have lower level of education than young people,


which might also lead to higher SBP30. In addition, we also found that working people were more likely to have an elevated DBP, and the possible reason might be related to social


engagement. Finally, the regression coefficient of family history of CVD increased with BP among all the research participates, which was consistent with other studies31. Thus, it was


implied that elderly people with family history of CVD, low-literacy and workers should pay more attention to their BP levels. Some limitations of our study should be noted. Firstly, the


results were conducted from a cross-sectional study in Jilin province, which might limit our ability to generalize the results. Secondly, other confounders that might have implications for


hypertension, such as parameters of glucose metabolism, renal function indices and genes, were not under our consideration this time, which might have some slight effects on our results.


CONCLUSIONS This study revealed interesting clues on how the whole continuum of SBP and DBP were associated with commonly researched factors of hypertension. High-salt diet, drinking and


HDL-C were positively associated with BP measures only in males. And the risk of TC had an increased trend with BP in females who used to live in town. The elderly, the obese, workers and


people with lower level of education and family history of CVD were expected to be positively associated with a higher SBP and/or DBP. METHODS STUDY POPULATION The large-scale


cross-sectional survey was conducted among people who aged 18 to79 years old and were living in Jilin Province for over 6 months in 2012. A total of 23,050 participants were selected through


multistage stratified random cluster sampling32 (see details in Part 1 of the Supplementary Material). For the purpose of the present analysis, the subjects who had anti-hypertensive


treatments were excluded, as well as those who had missing values in SBP or DBP. Finally, a total of 16,524 subjects were included in the present analyses. All participants provided written


informed consent, and the study was approved by the Institutional Review Board of the School of Public Health, Jilin University. And all methods were performed in accordance with the


relevant guidelines and regulations. DATA COLLECTION AND MEASUREMENT The data of this study included demographics (e.g., gender, age, etc.), health-related behaviors (e.g., smoking,


drinking, etc.), anthropometric measurements (e.g., height, weight, hypertension, etc.) and laboratory measurements (such as serum cholesterol and triglycerides). All investigation was


trained and followed the same questionnaire instructions. Height and weight were measured according to a standardized protocol and techniques, with the participants wearing clothing but no


shoes. A calibrated mercury sphygmomanometer was used to determine the blood pressure of subjects on the right arm, after at least 5 min of seated rest. The blood sample was obtained in the


morning from subjects after fasting for at least eight hours, and then conserved in tubes which contained ethylene diamine tetra acetic acid (EDTA). Fasting plasma glucose (FPG) and serum


lipids were measured using a Bai Ankang fingertip blood glucose monitor (Bayer, Leverkusen, Germany) and a MODULE P800 biochemical analysis machine (Roche Co., Ltd., Shanghai, China),


respectively33 (see details in Part 2 of the Supplementary Material). ASSESSMENT CRITERIA According to Seventh Joint National Commission Guidelines (JNC7), hypertension was defined as a


resting systolic blood pressure (SBP)/diastolic blood pressure (DBP) ≥ 140/90 mmHg or current use of antihypertensive medication34. Dyslipidemia was defined as the use of lipid-lowering


drugs in the past two weeks and/or meeting one or more of the following criteria: total cholesterol (TC) ≥ 6.22 mmol/L, triglyceride(TG) ≥ 2.26 mmol/L, low density lipoprotein cholesterol


(LDL-C) ≥ 4.14 mmol/L, high density lipoprotein cholesterol (HDL-C) < 1.04 mmol/L35. We defined diabetes as participants who reported diabetes mellitus previously diagnosed by physician


or those who have fasting plasma glucose (FPG) ≥ 7.0 mmol/L or oral glucose tolerance test (OGTT) 2 h plasma glucose (PG) ≥ 11.1 mmol/L36. BMI was defined as weight (kilogram) divided by


height (meter) squared. Drinker was defined as a person who consumed more than one alcoholic drink per week, including any form of alcohol37. High-salt diet was defined as a person who daily


salt intake more than 6 g38. Education stage was classified into compulsory education and lower education, secondary school education, senior school education, college education,


postgraduate education and higher education. STATISTICAL ANALYSIS All questionnaires were coded and double-entered. EpiData (version 3.1) was used for data entry and validation and R version


3.3.3(University of Auckland, Oakland, New Zealand) for data analysis. The data are presented as mean ± standard deviations (SD) or rate. In addition, quantitative variables and categorical


variables were analyzed using _t_ test and Rao-scott-_χ2_ test, respectively. Finally, QR in the quantreg package was used to estimate the conditional quantile of the distribution of SBP


and DBP under the influence of various risk factors. DATA AVAILABILITY The survey was implemented by School of Public Health, Jilin University and Jilin Center for Disease Control and


Prevention in Jilin Province in 2012. According to relevant regulations, we were sorry that the data can’t be shared. ABOUT THE DATA The survey was implemented by School of Public Health,


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61 prospective studies. _LANCET_ 360, 1903–1913 (2002). Article  PubMed  Google Scholar  Download references ACKNOWLEDGEMENTS I would like to express my gratitude to all those who have


helped me during the writing of this thesis. This work was supported by the Outstanding Youth Foundation of Science and Technology Department of Jilin Province, China (grant number:


20170520049JH); the National Natural Science Foundation of China (grant number: 11301213, 11571068); and the Scientific Research Foundation of the Health Bureau of Jilin Province, China


(grant number: 2011Z116). AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Epidemiology and Biostatistics, School of Public Health, NO. 1163 Xinmin Street, Jilin University, Changchun, Jilin,


China, 130021 Junsen Ye, Zhongmin Li, Yaogai Lv, Lan An, Jianxing Yu, Xin Guo, Yan Yao, Yaqin Yu & Lina Jin Authors * Junsen Ye View author publications You can also search for this


author inPubMed Google Scholar * Zhongmin Li View author publications You can also search for this author inPubMed Google Scholar * Yaogai Lv View author publications You can also search for


this author inPubMed Google Scholar * Lan An View author publications You can also search for this author inPubMed Google Scholar * Jianxing Yu View author publications You can also search


for this author inPubMed Google Scholar * Xin Guo View author publications You can also search for this author inPubMed Google Scholar * Yan Yao View author publications You can also search


for this author inPubMed Google Scholar * Yaqin Yu View author publications You can also search for this author inPubMed Google Scholar * Lina Jin View author publications You can also


search for this author inPubMed Google Scholar CONTRIBUTIONS The authors would like to thank Dr Lina Jin and others who kindly provided their R code for analysis and experience for writing


paper. Junsen Ye and Lina Jin had the original idea for the study and carried out the design. Lina Jin and Zhongmin Li provided valuable insight regarding the methodological approach and


organization of the manuscript. Junsen Ye, Jianxing Yu, Yaogai Lv and Lan An carried out the statistical analysis and reviewed the consistency of data included in the paper. Junsen Ye and


Zhongmin Li drafted the manuscript. Xin Guo, Yan Yao and Yaqin Yu revised the manuscript. All authors read and approved the final manuscript. CORRESPONDING AUTHOR Correspondence to Lina Jin.


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Pressure with the Factors among Adults in Jilin Province: A Cross-Sectional Study Using Quantile Regression Analysis. _Sci Rep_ 7, 13613 (2017). https://doi.org/10.1038/s41598-017-14045-0


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