Effects of BMI and lean body mass index on all-cause mortality in elderly Chinese
- Author:
HE Qian
;
CHENG Yi
;
CHENG Xin
;
QI Ran
;
WU Cheng
- Publication Type:Journal Article
- Keywords:
Body mass index;
lean body mass index;
elderly;
all-cause mortality
- From:
China Tropical Medicine
2024;24(6):637-
- CountryChina
- Language:Chinese
-
Abstract:
Abstract: Objective To compare the different effects of body mass index (BMI) and lean body mass index (LBMI) on the risk of all-cause death among elderly Chinese individuals. For the more scientific, accurate and convenient measurement of the elderly physique, analysis and evaluation of the health risk factors of the elderly in China. Methods This study is based on follow-up data from 2014 to 2018, involving 5 990 participants who met the inclusion criteria in the Chinese Longitudinal Healthy Longevity Survey. Participants were grouped according to their BMI and LBMI, and both univariate and multivariate Cox proportional hazard models were established to compare the effects of BMI and LBMI on the risk of death in the elderly. According to gender, age, activities of daily living, and comorbidities, subgroup analysis was conducted to study the influence of LBMI in different subgroups. Results The study population predominantly comprised females (52.9%, 3 167/5 990), with an average age of (84.7 ± 10.1) years, and most participants lived in rural areas (55.1%, 3 298/5 990). A majority were non-smokers (82.7%, 4 952/5 990) and non-drinkers (84.3%, 5 050/5 990). The prevalence of hypertension was 32.8% (1 966/ 5 990), diabetes 5.6% (334/5 990), and heart disease 12.9% (774/5 990). In the analysis of the impact of BMI on all-cause death in the elderly, univariate analysis showed that an increase in BMI was associated with a reduced risk of mortality. After adjusted by multiple factors (age, gender, living environment, marital status, average arterial pressure, number of children, smoking, drinking, hypertension, diabetes, heart disease, cerebrovascular disease, tumor, ADL/IADL, number of complications), compared to the normal group, the emaciated group (BMI<18.5 kg/m2) had the highest risk of death (HR=1.15,95%CI: 1.01-1.30); the overweight group (24.0 kg/m2≤BMI<28.0 kg/m2) had a lower risk of death (HR=0.78, 95%CI: 0.67-0.91). In the analysis of the impact of LBMI on the risk of death in the elderly, compared to moderate LBMI, lower LBMI was associated with a higher risk of death. Multivariate analysis showed that compared with moderate LBMI, a decrease in LBMI increased the risk of death, whereas an increase in LBMI did not show statistically significant differences in mortality risk in the elderly. Conclusion In measuring fitness and quality of life in the elderly, LBMI has better representativeness and practical value.
- Full text:20250618094611381512.Effects of BMI and lean body mass index on all-cause mortality in elderly Chinese.pdf
