Table 2.

Summary of Characteristics in Our Study Cohorts Before and After Propensity Score Matching Among Beneficiaries with the First Readmission 9-12 Months Post Discharge and Their Matched Controls

		Before Matching			After Matching
		Readmission		P-value	Readmission		P- value
		No	Yes	P-value	No	Yes	P- value
N		61,500	5,377		25,081	5,184
Female, %		45.3	44.9	0.54	42.4	44.6	0.003
	White	81.7	78.7	<.001	79.5	79.0	0.40
	Black	8.8	11.1	<.001	10.9	11.0	0.75
	Hispanic	6.1	6.9	0.04	6.5	6.7	0.71
Race, %	Asian	2.1	2.0	0.68	1.9	2.0	0.64
	Native	0.5	0.7	0.23	0.7	0.7	0.92
	Others	0.8	0.7	0.45	0.6	0.7	0.37
	<35	0.1	0.3	0.01	0.2	0.3	0.30
	35-50	3.5	3.4	0.81	3.2	3.3	0.77
	51-64	10.6	10.9	0.51	10.4	10.7	0.49
Age, %	65-74	32.3	28.7	<.001	27.9	28.7	0.21
	75-84	32.8	32.3	0.43	32.4	32.3	0.95
	≥85	20.7	24.5	<.001	25.9	24.6	0.05
Dual eligibles, %		40.0	45.7	<.001	46.3	45.7	0.42
Non-dual LIS, ≤150% FPL, %		7.4	7.7	0.42	6.8	7.6	0.03
Disabled, %		14.2	14.6	0.45	13.9	14.3	0.37
Pre MI, %		7.9	13.2	<.001	12.5	13.2	0.07
More than 90 days in SNF, %		0.1	0.1	0.38	0.1	0.1	0.88
	RxHCC	1.1	1.2	<.001	1.2	1.2	0.57
Risk scores	CMS-HCC	2.0	2.3	<.001	2.3	2.3	0.07
	Percent of high school	57.6	57.4	0.09	57.6	57.3	0.07
Zip-Code	Percent of college	21.2	20.7	0.005	20.6	20.7	0.71
Level	Log of median household income	10.6	10.6	0.08	10.6	10.6	0.28

Abbreviations: MI = myocardial infarction; LIS = low-income subsidy; FPL = Federal Poverty Line; RxHCC = Prescription drug Hierarchical Condition Category risk scores, and CMS-HCC = Centers for Medicare & Medicaid Services - Hierarchical Condition Category risk scores.