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| Association between body mass index and mortality among older Chinese: evidence from CHARLS |
| WANG Junping1, LU Zhaojun1, KOU Shuo1, ZHENG Weijun1, XIE Kaihong2, WANG Weihao1, RONG Chao2
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1. School of Public Health, Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, China;
2. Zhejiang Chinese Medical University, Hangzhou, Zhejiang 310053, China |
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Abstract Objective To investigate the association between body mass index ( BMI ) and mortality risk among older Chinese based on the China Health and Retirement Longitudinal Study ( CHARLS ). Methods The demographic features, BMI, prevalence of chronic diseases and mortality among the elderly at ages of 60 years and greater were captured from the CHARLS database from 2011 to 2018. A multivariable Cox proportional hazards regression model was used to examine the association between BMI and the risk of death. Results Totally 6 023 subjects were enrolled, including 3 006 men ( 50.09% ) and 3 017 women ( 49.91% ), and 68.69% of the participants ( 4 137 subjects ) were at ages of 60 to 69 years. There were 637 subjects ( 10.58% ) with underweight, 1 544 ( 25.63% ) with overweight, and 557 ( 9.25% ) with obesity. During the follow-up period ( 35 091 person-years ), 1 035 subjects died. Multivariable Cox proportional hazards regression analysis revealed an increased risk of mortality among the underweight elderly ( HR=1.496, 95%CI: 1.261-1.775 ) and a reduced risk of mortality among the obese elderly ( HR=0.671, 95%CI: 0.511-0.881 ) relative to the elderly with normal weight, after adjustment for age, gender, smoking, household registration, administration of anti-diabetic drugs, administration of anti-dyslipidemia drugs, and administration of anti-hypertensive drugs. Conclusion It is found that the risk of mortality among the Chinese elderly correlatives with BMI through the analysis of CHARLS data.
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Received: 07 December 2021
Revised: 01 February 2022
Published: 13 April 2022
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