Table 1.

Summary of Characteristics in Our Study Cohorts Before and After Propensity Score Matching Among Beneficiaries with the First Readmission 6-9 Months Post Discharge and Their Matched Controls

		Before Matching			After Matching
		Readmission		P- value	Readmission		P- value
		No	Yes	No	Yes
N		68,074	7,150		33,381	6,864
Female, %		45.2	43.1	<.001	42.4	42.7	0.60
	White	81.4	77.1	<.001	78.0	77.5	0.44
	Black	9.0	12.5	<.001	12.0	12.5	0.23
	Hispanic	6.2	6.9	0.02	6.5	6.6	0.90
Race, %	Asian	2.0	2.1	0.83	2.1	2.0	0.74
	Native	0.6	0.7	0.18	0.7	0.7	0.84
	Others	0.7	0.7	0.75	0.7	0.7	0.70
	<35	0.2	0.1	0.22	0.1	0.1	0.93
	35-50	3.4	3.2	0.31	3.0	3.1	0.51
	51-64	10.6	12.4	<.001	12.1	12.3	0.62
Age, %	65-74	31.8	26.6	<.001	25.4	26.6	0.02
	75-84	32.7	33.2	0.41	33.8	33.1	0.26
	>85	21.3	24.4	<.001	25.7	24.8	0.10
Dual eligible		40.7	48.2	<.001	48.4	48.0	0.49
Non-dual LIS, <150% FPL		7.4	7.0	0.32	7.7	7.0	0.06
Disabled, %		14.1	15.7	<.001	15.1	15.5	0.44
Pre MI, %		8.4	13.9	<.001	12.8	13.7	0.02
More than 90 days in SNF, %		0.1	0.1	0.10	0.1	0.1	0.39
	RxHCC	1.1	1.2	<.001	1.2	1.2	0.005
Risk scores	CMS-HCC	2.0	2.4	<.001	2.3	2.4	<.001
	Percent of high school	57.6	57.4	0.24	57.4	57.4	0.97
Zip-Code	Percent of college	21.2	20.6	0.001	20.6	20.6	0.99
Level	Log of median household income	10.6	10.6	<.001	10.6	10.6	0.84

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.