pres appam nov9_gonzales
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The Impact of Same-Sex Marriage on
Health Insurance Coverage: Evidence from Four States
Gilbert Gonzales, MHA
University of Minnesota
Association for Public Policy Analysis & Management
Policy Research on Same-Sex Marriage
Saturday, November 9, 2013
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Background
Same-sex couples are less likely to have health
insurance, especially through employers
NHIS (Heck et al. 2006)
CPS (Ash & Badget, 2006)
BRFSS (Buchmueller & Carpenter, 2010)
ACS (Gonzales & Blewett, 2014)
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Most Americans are covered through a
family member’s employer health plan
“Legal” spouse
Dependent children
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Employers often required to extend benefits to
same-sex spouses after same-sex marriage
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Source: National Conference of State Legislatures
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Research Question
What is the effect of same-sex marriage on
health insurance coverage among same-sex
couples?
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American Community Survey, 2008-2011
Health insurance added in 2008
• Employer-Sponsored Insurance (ESI)
• Directly Purchased / Individual
• Medicare
• Medicaid
• Uninsured
Large sample size!
• 3 million people each year
• Supports state level research
• Leading data resource for same-sex couples
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Difference-in-Differences (DD) Analysis
Pre-Post research design
• Target group: Same-sex couples in 4 states (CT, IA, NH, VT)
• Comparison groups unaffected by policy change
1) married opposite-sex couples in same state
2) same-sex couples in neighboring states
Linear probability models controlling for:
• Race/ethnicity, age, income, educational attainment,
employment status, industry, related child in household,
citizenship, state fixed effects
Separate models for:
• State with no provisions adopting marriage (IA)
• States replacing civil unions/domestic partnerships with
marriage (CT, NH, VT)
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Difference-in-Differences (DD) Analysis
Yi = β0 + β1Treat + β2Post + β3Treat*Post + Xi + ε
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From No Provisions to Same-Sex Marriage
8.2% 9.3%
0.0%
2.0%
4.0%
6.0%
8.0%
10.0%
12.0%
Men Women
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Dif
fere
nc
e-i
n-D
iffe
ren
ces (
DD
)
Comparison Group 1:
Married Opposite-Sex Couples in Iowa
Adjusts for race/ethnicity, age, employment, industry, income, state, citizenship, minor child.
Source: American Community Survey, 2008-2011. * indicates p<0.05
+ +
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8.2% 9.3%
7.7%
9.6%
0.0%
2.0%
4.0%
6.0%
8.0%
10.0%
12.0%
Men Women Men Women
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Dif
fere
nc
e-i
n-D
iffe
ren
ces (
DD
)
Comparison Group 1:
Married Opposite-Sex Couples in Iowa
Comparison Group 2:
Same-Sex Couples Neighboring Iowa
Adjusts for race/ethnicity, age, employment, industry, income, state, citizenship, minor child.
Source: American Community Survey, 2008-2011. * indicates p<0.05
+ +
+
+
From No Provisions to Same-Sex Marriage
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From Civil Unions to Same-Sex Marriage
0.1%
7.6%
-2.0%
0.0%
2.0%
4.0%
6.0%
8.0%
Gay Men Lesbian Women
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Dif
fere
nc
e-i
n-D
iffe
ren
ces (
DD
)
Comparison Group 1:
Married Opposite-Sex Couples in
CT, NH, VT
Adjusts for race/ethnicity, age, employment, industry, income, state, citizenship, minor child.
Source: American Community Survey, 2008-2011. * indicates p<0.05
* +
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From Civil Unions to Same-Sex Marriage
0.1%
7.6%
-1.4%
7.5%
-2.0%
0.0%
2.0%
4.0%
6.0%
8.0%
Men Women Women
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Dif
fere
nc
e-i
n-D
iffe
ren
ces (
DD
)
Comparison Group 1:
Married Opposite-Sex Couples in
CT, NH, VT
Comparison Group 2:
Same-Sex Couples Neighboring
CT, NH, VT
Adjusts for race/ethnicity, age, employment, industry, income, state, citizenship, minor child.
Source: American Community Survey, 2008-2011. * indicates p<0.05
* *
Men
+ +
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Key Findings
1) Same-sex marriage leads to ~7.5% increase in health
insurance coverage for women in same-sex
relationships
2) Limited evidence that same-sex marriage improved
health insurance coverage in Iowa or for men
3) Detectable gains in coverage by replacing civil union
laws with legal same-sex marriage
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www.shadac.org
@shadac
PhD Student
Graduate Research Assistant
University of Minnesota
School of Public Health
Division of Health Policy & Management
Gilbert Gonzales, MHA
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Discussion
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GLB Population in the ACS
• Same-sex spouses / unmarried partners
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