TABLE 2

Effects of FQHC Delivery Site Density on ED Visit Rates, Children Ages 0 to 18, 2005 to 2012

Quartile, Sites per 100 Square MilesMedicaidUninsured
IRRPIRRP
<0.12Reference.05aReference<.01a
0.12–0.450.98.750.79.09
0.46–1.380.78.110.63<.01
>1.380.82.030.60.01
  • Results of a negative binomial model with robust SEs showing the effects of FQHC delivery site density on ED visit rate by county among children ages 0 to 18 who are either uninsured or have Medicaid insurance. Estimates adjusted for year and county as fixed effects as well as time-varying county-level covariates including percentage of population living in poverty, median household income, unemployment rate, primary care doctors per population, short-term hospital beds per population, percentage of the population with a college degree, health professional shortage area status, percentage of population who are African American, and percentage who are Hispanic. IRR = incidence rate ratio.

  • a Overall P value for heterogeneity across 4 quartiles.