spatial analysis of health care accessibility in indiana susan chen brigitte waldorf department of...
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Spatial Analysis of Health Care
Accessibility in Indiana
Susan Chen Brigitte Waldorf
Department of Agricultural EconomicsPurdue University
Contact:[email protected]
Space, Health and Population Economics
SHaPE
Federal Programs to Increase Accessibility
US 2005:
• $2.6 billion spent on improving accessibility to health care services
• 3,032 HPSAs in the USA
Indiana 2005:
Research Aims
1. Pilot study using Indiana data
a. Design a measure of accessibility
(i) Use the measure to: Simulate policy changes Examine the effect on health outcomes
2. Expand study area to the United States and examine the changes over time
Spatial Variation in Health Care Services
Does availability / accessibility of health care services have a
beneficial impact on the health status of the population?
Developing Countries
1st to 2nd stage of epidemiological transition
Yes
Developed Countries
2nd to 3rd stage of epidemiological transition
Mixed Evidence
Spatial Variation in Health Outcomes
Spatial Variation in Health Behaviors
Health Production Function (HPF)
Inputs:• Life style• Socio-economics• Environment• Genetic Endowment• Medical Resources
Health Outcome• Morbidity• Mortality
Health Production Function (HPF)
Inputs:• Life style• Socio-economics• Environment• Genetic Endowment• Medical Resources
Health Outcome• Morbidity• Mortality
Health Behaviors
Inputs of the HPF
Health Behaviors in Region i
Spatial Spillovers
Health Behaviors in Region j
Health Outcomes in Region i
Health Outcomes in Region j
Spatial Health Production Function
Models
Estimated for n = 92 Indiana counties
Spatial weight matrix, W: 9292 spatial contiguity matrix:
(1) Non-spatial model: Y = Xβ + ε, ε ~ N(0,σ2)
(2a) Spatial error model: Y = Xβ + ε, and ε = λWε +μ , μ ~ N(0,σ2)
(2b) Spatial lag model: Y = ρWY+Xβ + ε or Y = (I-ρW)-1{Xβ+ε}
otherwise
bordercommonasharejiifikijw 0
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VAR Variable Definition Data Source
INFCUM Infant mortality rate, 1990-2003Kids Count Indiana
PLBW03 % Low Birth Weight 2003
AEMORTAge-adjusted Elderly(55+) Mortality Rate 2003 Indiana Health
DepartmentELCVDR CVD Deaths per 100000 Elderly
ECANCR Cancer Deaths per 100,000 Elderly
SMOKE03 % Mothers smoking during pregnancy
Kids Count IndianaPRENAT03% Mothers Receiving Prenatal Care during 1st Trimester 2003
PKID02 % Kids with a Healthy Beginning 2002
TEENALL03Teenage Pregnancy Rate 2003 [births per 1,000 teenage girls]
Indiana Health Department
NURSEPP Nurses per 10,000 residents Stats Indiana
ACCHOSP Access to Hospital Care Unal et al. 2007
HHINC Medium Household Income [$1,000]Stats Indiana
PBS % Pop with BS+
PUNINS % Uninsured
IRR Index of Relative Rurality, 2000 Waldorf 2007
Health Outcomes
Health Behaviors
Controls
Availability
Accessibility
1. Health outcomes (mortality) are not influenced by medical resources, whether measured as availability of nurses or distance-based accessibility to hospital care.
Results
2. Healthcare availability (nurses per persons) has a beneficial effect on:
* % of pregnant women seeking prenatal care during the first trimester;
* teenage pregnancies.
Results
3. We find evidence of spatial spillovers for:* cardiovascular disease mortality* smoking during pregnancy* prenatal care
cultures/norms of health behaviors diffuse across space.
Results
Future Research Issues• Extend pilot study to a spatial analysis of all U.S.
counties even more pronounced disparities in health status as well as in spatial access to health care services.
• Spatial scale issues • Spatial structures, e.g. asymmetries
• Health outcome measures
• Over time
Changes in the supply of health services across time
Simulations of Changes in Supply of Healthcare
Services• Closure of rural health clinics located within 10 miles from a hospital
• Closure of rural health clinics more than 15 miles from a hospital
• Increase in the capacity of hospital beds in three regional centers (Bloomington, Lafayette, and Fort Wayne)
Closure of Health Clinics more than 15
miles awayCurrently - 18.2 % of rural clinics are located more than 15 miles from a hospital e.g. Martin, Brown, Davies, and Clay, Vermillion, Switzerland, Newton and Crawford
Policy Impacts – Southern counties along the Ohio River (band of counties from Clay to Crawford) will be most affected