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Table 2 Multivariate results estimating likelihood of delivering oral surgery following Medicaid expansion (n = 2054), 2012–2017

From: Impact of the Affordable Care Act Medicaid expansion on oral surgery delivery at community health centers: an observational study

 

Outcome: oral surgery services visits per year

Difference-in-differences model

No expansion

Ref

Medicaid expansion × post-expansion

0.913*

(0.034)

Event study model

Medicaid expansion by time relative to expansion year

 

 2012 (Year −2)

0.998

(0.052)

 2013 (Year −1)

Ref

 2014 (Year 0)

1.017

(0.072)

 2015 (Year 1)

0.928+

(0.041)

 2016 (Year 2)

0.865+

(0.067)

 2017 (Year 3)

0.853*

(0.06)

Covariates

Hispanic patients (%)

0.998

(0.004)

White, non-Hispanic patients (%)

1.004

(0.005)

Black, non-Hispanic patients (%)

1.002

(0.004)

Female patients (%)

0.989

(0.014)

Patients < 18 years old (%)

1.007

(0.006)

Patients < 100% of poverty level (%)

0.998

(0.004)

Patients with depression/mood disorder diagnosis (%)

0.991

(0.009)

Patients with diabetes mellitus diagnosis (%)

0.966+

(0.022)

Total patients (in 1000s)

1.018**

(0.003)

Unemployment rate (state—%)

1.01

(0.043)

Persons reporting poor or fair health (state—%)

1.004

(0.009)

Persons experiencing obesity (state—%)

1.025*

(0.012)

  1. Authors’ analysis of data from the Uniform Data System, Kaiser Family Foundation, Bureau of Labor Statistics, and IPUMS CPS. +P < 0.10, *P < 0.05, **P < 0.01. This table shows the event study coefficient estimates and the coefficient estimate from the difference-in-differences model. All multivariate parameter estimates are provided as incidence rate ratios (IRRs), or the cumulative incidence of an outcome in one group over the cumulative incidence of the outcome in the reference group (i.e., non-expansion-state CHCs), not as differences in the logs of expected counts. State effects and state year trend estimates not shown. Seventeen states were included in the main analysis, including AR, CO, IA, IL, MA, NC, NE, NM, NY, OH, OR, RI, SC, SD, VT, WI, WY