J Wang1, A W Taylor, T Zhang, S Appleton, Z Shi. 1. Zumin Shi, Discipline of Medicine, University of Adelaide, Level 7, SAHMRI, North Terrace, Adelaide, Australia, 5005. Phone: +61 8 8313 1188; Fax: +61 8 8313 1228; Email: Zumin.shi@adelaide.edu.au.
Abstract
OBJECTIVES: To examine the association between BMI and all-cause mortality in the oldest old (≥80 years). DESIGN: The study used a prospective cohort study design. SETTING: Chinese Longitudinal Healthy Longevity Survey (CLHLS) between 1998/99 and 2011. POPULATION: 8026 participants aged 80 years and older were followed every two to three years. MEASUREMENTS: Body weight and knee height were measured. Height was calculated based on knee height using a validated equation. Deaths were ascertained from family members during follow-up. RESULTS: The mean BMI was 19.8 (SD 4.5) kg/m2. The prevalence of underweight, overweight and obese was 37.5%, 10.2% and 4.4%, respectively. There were 5962 deaths during 29503 person-years of follow-up. Compared with normal weight, underweight was associated with a higher mortality risk (HRs: 1.20 (95%CI 1.13-1.27) but overweight (HR 0.89 (95%CI 0.81-0.99)) were associated with a lower risk. Obesity had a HR 0.91 (95%CI 0.78-1.05) for mortality. CONCLUSION: Among oldest old Chinese, underweight is associated with an increased risk of all-cause mortality but overweight is associated with a reduced risk. Interventions to reduce undernutrition should be given priority among the oldest old Chinese.
OBJECTIVES: To examine the association between BMI and all-cause mortality in the oldest old (≥80 years). DESIGN: The study used a prospective cohort study design. SETTING: Chinese Longitudinal Healthy Longevity Survey (CLHLS) between 1998/99 and 2011. POPULATION: 8026 participants aged 80 years and older were followed every two to three years. MEASUREMENTS: Body weight and knee height were measured. Height was calculated based on knee height using a validated equation. Deaths were ascertained from family members during follow-up. RESULTS: The mean BMI was 19.8 (SD 4.5) kg/m2. The prevalence of underweight, overweight and obese was 37.5%, 10.2% and 4.4%, respectively. There were 5962 deaths during 29503 person-years of follow-up. Compared with normal weight, underweight was associated with a higher mortality risk (HRs: 1.20 (95%CI 1.13-1.27) but overweight (HR 0.89 (95%CI 0.81-0.99)) were associated with a lower risk. Obesity had a HR 0.91 (95%CI 0.78-1.05) for mortality. CONCLUSION: Among oldest old Chinese, underweight is associated with an increased risk of all-cause mortality but overweight is associated with a reduced risk. Interventions to reduce undernutrition should be given priority among the oldest old Chinese.
Entities:
Keywords:
Body mass index; Chinese; all-cause mortality; cohort study; older adults
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