Body mass index trajectories and all-cause mortality in older Chinese adults: Hong Kong's Elderly Health Service Cohort.

IF 4.9 2区 医学 Q1 PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH
Man Ki Kwok, Siu Yin Lee, Gabriel M Leung, C Mary Schooling
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引用次数: 0

Abstract

Background: Weight loss at older ages appears to be associated with higher mortality in Western and some East Asian countries, despite differences in the prevalence of obesity; whether it is relevant to China is unknown. We examined the association of body mass index (BMI) trajectories with all-cause mortality in older Chinese adults by sex and baseline age (65-69 years, 70+ years).

Methods: 54 160 participants aged 65 or above from Hong Kong's Elderly Health Service Cohort with at least five BMI measurements were included. We identified distinct BMI trajectories using group-based trajectory modelling. We assessed the associations of BMI trajectories with mortality risk using a Cox model stratified by sex and age.

Results: Compared with 'normal weight, stable', the 'low-normal weight, decreasing' had higher mortality risk in both sexes and age groups (eg, HR 1.43, 95% CI 1.24 to 1.66 in men aged 65-69 years). The 'overweight, stable' and 'obese, stable' had lower mortality risk, especially in men at older ages. However, the proportion in the 'low-normal weight, decreasing' was greater at 70+ years than at 65-69 years, while the proportion in the 'overweight, stable' and 'obese, stable' was lower in the older group.

Conclusions: Decreasing BMI is a likely symptom of ill health in older adults. Inconsistency between the risks and the proportion in each BMI trajectory group by age suggests the observed associations could be driven by changes in weight and preferential recruitment of survivors. Maintaining a healthy weight remains relevant at older ages.

中国老年人的体重指数轨迹和全因死亡率:香港长者健康服务队列。
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来源期刊
Journal of Epidemiology and Community Health
Journal of Epidemiology and Community Health 医学-公共卫生、环境卫生与职业卫生
CiteScore
11.10
自引率
0.00%
发文量
100
审稿时长
3-6 weeks
期刊介绍: The Journal of Epidemiology and Community Health is a leading international journal devoted to publication of original research and reviews covering applied, methodological and theoretical issues with emphasis on studies using multidisciplinary or integrative approaches. The journal aims to improve epidemiological knowledge and ultimately health worldwide.
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