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Int J Epidemiol. 2010 Aug;39(4):1037-45. doi: 10.1093/ije/dyp364. Epub 2009 Dec 23.

A prospective study of body mass index and mortality in Bangladesh.

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1
Department of Health Studies, The University of Chicago, Chicago, IL 60637, USA.

Abstract

BACKGROUND:

Body mass index (BMI) (kg/m(2)) has a U- or J-shaped relationship with all-cause mortality in Western and East Asian populations. However, this relationship is not well characterized in Bangladesh, where the BMI distribution is shifted towards lower values.

METHODS:

Using data on 11,445 individuals (aged 18-75 years) participating in the Health Effects of Arsenic Longitudinal Study (HEALS) in Araihazar, Bangladesh, we prospectively examined associations of BMI (measured at baseline) with all-cause mortality during approximately 6 years of follow-up. We also examined this relationship within strata of key covariates (sex, age, smoking, education and arsenic exposure). Cox proportional hazards models adjusted for these covariates and BMI-related illnesses were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs) for BMI categories defined by the World Health Organization.

RESULTS:

Low BMI was strongly associated with increased mortality in this cohort (P-trend < 0.0001). Severe underweight (BMI < 16 kg/m(2); HR 2.06, CI 1.53-2.77) and moderate underweight (16.0-16.9 kg/m(2); HR 1.39, CI 1.01-2.90) were associated with increased all-cause mortality compared with normal BMI (18.6-22.9 kg/m(2)). The highest BMI category (> or =23.0 kg/m(2)) did not show a clear association with mortality (HR 1.10, CI 0.77-1.53). The BMI-mortality association was stronger among individuals with <5 years of formal education (interaction P = 0.02).

CONCLUSIONS:

Underweight (presumably due to malnutrition) is a major determinant of mortality in the rural Bangladeshi population.

PMID:
20032266
PMCID:
PMC2929350
DOI:
10.1093/ije/dyp364
[Indexed for MEDLINE]
Free PMC Article
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