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Abstract
Objective
The clustering of multiple cardiovascular disease (CVD) risk factors (CRFs) increases
the risk of CVD prevalence and mortality. Little is known about CRF clustering among
community-dwelling older people in Xinjiang. The objective of this study was to explore
the prevalence of CRF clustering in this population.
Design
Cross-sectional study.
Setting
Xinjiang, China.
Participants
Multilevel random sampling was used to survey individuals aged ≥60 in six regions
of Xinjiang. In total, 87 000 participants volunteered, with a response rate of 96.67%;
702 participants with incomplete data were excluded and data from 86 298 participants
were analysed.
Outcome measures
The prevalence of smoking, hypertension, diabetes, dyslipidaemia and overweight/obesity
was 9.4%, 52.1%, 16.8%, 28.6% and 62.7%, respectively. The prevalence of CRF clusters
among people of different ages, regions and ethnic groups differed significantly.
The 85.7% of the participants presented at least one CRFs and 55.9% of the participants
presented clustering of CRFs. The proportion of CRF clusters tended to be higher in
men, 60–69-year-old group, northern Xinjiang and the Kazakh population. After adjusting
for age and sex, logistic regression analysis revealed that men, 60–69-year-old group,
northern Xinjiang and the Kazakh population were more likely to have clustering of
CRFs, compared with their counterparts.
Conclusions
The prevalence of CRFs in the older Xinjiang population is high and their clustering
differs by sex, age, region and ethnicity. CRF prevention and management should be
active in this population, and strategies to reduce CVD risk based on sex, age, ethnic
group and region are warranted.
Summary Background The main associations of body-mass index (BMI) with overall and cause-specific mortality can best be assessed by long-term prospective follow-up of large numbers of people. The Prospective Studies Collaboration aimed to investigate these associations by sharing data from many studies. Methods Collaborative analyses were undertaken of baseline BMI versus mortality in 57 prospective studies with 894 576 participants, mostly in western Europe and North America (61% [n=541 452] male, mean recruitment age 46 [SD 11] years, median recruitment year 1979 [IQR 1975–85], mean BMI 25 [SD 4] kg/m2). The analyses were adjusted for age, sex, smoking status, and study. To limit reverse causality, the first 5 years of follow-up were excluded, leaving 66 552 deaths of known cause during a mean of 8 (SD 6) further years of follow-up (mean age at death 67 [SD 10] years): 30 416 vascular; 2070 diabetic, renal or hepatic; 22 592 neoplastic; 3770 respiratory; 7704 other. Findings In both sexes, mortality was lowest at about 22·5–25 kg/m2. Above this range, positive associations were recorded for several specific causes and inverse associations for none, the absolute excess risks for higher BMI and smoking were roughly additive, and each 5 kg/m2 higher BMI was on average associated with about 30% higher overall mortality (hazard ratio per 5 kg/m2 [HR] 1·29 [95% CI 1·27–1·32]): 40% for vascular mortality (HR 1·41 [1·37–1·45]); 60–120% for diabetic, renal, and hepatic mortality (HRs 2·16 [1·89–2·46], 1·59 [1·27–1·99], and 1·82 [1·59–2·09], respectively); 10% for neoplastic mortality (HR 1·10 [1·06–1·15]); and 20% for respiratory and for all other mortality (HRs 1·20 [1·07–1·34] and 1·20 [1·16–1·25], respectively). Below the range 22·5–25 kg/m2, BMI was associated inversely with overall mortality, mainly because of strong inverse associations with respiratory disease and lung cancer. These inverse associations were much stronger for smokers than for non-smokers, despite cigarette consumption per smoker varying little with BMI. Interpretation Although other anthropometric measures (eg, waist circumference, waist-to-hip ratio) could well add extra information to BMI, and BMI to them, BMI is in itself a strong predictor of overall mortality both above and below the apparent optimum of about 22·5–25 kg/m2. The progressive excess mortality above this range is due mainly to vascular disease and is probably largely causal. At 30–35 kg/m2, median survival is reduced by 2–4 years; at 40–45 kg/m2, it is reduced by 8–10 years (which is comparable with the effects of smoking). The definite excess mortality below 22·5 kg/m2 is due mainly to smoking-related diseases, and is not fully explained. Funding UK Medical Research Council, British Heart Foundation, Cancer Research UK, EU BIOMED programme, US National Institute on Aging, and Clinical Trial Service Unit (Oxford, UK).
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History
Date
received
: 15
October
2021
Date
accepted
: 25
July
2022
Funding
Funded by:
FundRef http://dx.doi.org/10.13039/501100001809, National Natural Science Foundation of China;
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