Table 3.

Estimated percentage change in probabilities of ED visits per person according to primary expected payer and age group, 2009 to 2011.^*

	Age, Years, %				Model-Estimated Change in Probability of Payer, % (95% CI)†
Expected Primary Payer	19–25, Pre-ACA	19–25, Post-ACA	26–31, Pre-ACA	26–31, Post-ACA
Medicare	1.4	1.6	3.5	3.9	−0.6 (−2.2 to 1.1)
Medicaid	28.8	35.2	26.4	33.7	−4.1 (−4.5 to −3.6)
Private insurance	32.8	29.4	35.9	28.7	12.5 (12.0 to 13.0)
Self-pay	29.9	26.9	26.7	26.2	−7.9 (−8.3 to −7.5)

^*California, Florida, and New York state inpatient database and state ED database data sets, 2009 to 2011.

^†The modeled relative change in the probability of each payer category was estimated with Poisson relative-risk regression analysis, with change after the implementation of the ACA provision measured by the interaction of the post-ACA period and the younger age group.