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Association between Body Mass Index and All-Cause Mortality among Oldest Old Chinese
1Zumin 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;
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.
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