The relationship between body mass index and hospitalisation rates, days in hospital and costs: findings from a large prospective linked data study

Internationally there is limited empirical evidence on the impact of overweight and obesity on health service use and costs. We estimate the burden of hospitalisation-admissions, days and costs-associated with above-normal BMI. Population-based prospective cohort study involving 224,254 adults aged...

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Bibliographic Details
Published in:PloS one 2015-03, Vol.10 (3), p.e0118599-e0118599
Main Authors: Korda, Rosemary J, Joshy, Grace, Paige, Ellie, Butler, James R G, Jorm, Louisa R, Liu, Bette, Bauman, Adrian E, Banks, Emily
Format: Article
Language:English
Subjects:
Adults
Age
Aged
Aged, 80 and over
Alcohol use
Alcoholic beverages
Analysis
Body mass
Body Mass Index
Body size
Body weight
Cost analysis
Costs
Economic aspects
Empirical analysis
Female
Health care
Health care costs
Health risk assessment
Hospitalization
Humans
Length of Stay - economics
Male
Middle Aged
Models, Statistical
Obesity
Overweight
Patient Admission - statistics & numerical data
Population studies
Prospective Studies
Regression analysis
Smoking
Studies
Surveys
Surveys and Questionnaires
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Summary:Internationally there is limited empirical evidence on the impact of overweight and obesity on health service use and costs. We estimate the burden of hospitalisation-admissions, days and costs-associated with above-normal BMI. Population-based prospective cohort study involving 224,254 adults aged ≥45y in Australia (45 and Up Study). Baseline questionnaire data (2006-2009) were linked to hospitalisation and death records (median follow-up 3.42y) and hospital cost data. The relationships between BMI and hospital admissions and days were modelled using zero-inflated negative binomial regression; generalised gamma models were used to model costs. Analyses were stratified by sex and age (45-64, 65-79, ≥80y), and adjusted for age, area of residence, education, income, smoking, alcohol-intake and private health insurance status. Population attributable fractions were also calculated. There were 459,346 admissions (0.55/person-year) and 1,483,523 hospital days (1.76/person-year) during follow-up. For ages 45-64y and 65-79y, rates of admissions, days and costs increased progressively with increments of above-normal BMI. Compared to BMI 22.5-
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0118599