Table 2. Changes in Probability of Insurance Coverage Among Admissions for Surgical Conditions After the Medicaid Expansion.

Insurance Coverage	Expansion States			Nonexpansion States			Difference-in-Differences [P Value]
	Before, %	After, %	Difference, Percentage Points	Before, %	After, %	Difference, Percentage Points	Unadjusted, Percentage Points	Adjusted (95% CI), Percentage Pointsa
Uninsured	14.1	6.8	−7.3	21.2	21.9	0.6	−7.9 [.001]	−7.5 (−12.2 to −2.9) [.002]
Medicaid	22.1	30.5	8.4	18.0	18.0	0.0	8.4 [.001]	8.6 (6.1 to 11.1) [<.001]
Private	63.9	62.7	−1.2	60.8	60.1	−0.7	−0.5 [.26]	−1.0 (−5.1 to 3.0) [.62]

^aAdjusted for patient age, sex, race/ethnicity, comorbidity, secular trends, and clustering at hospital level.