Table 2.

Patient characteristics before and after propensity score matching, ACO versus non-ACO hospitals

	Before matching			After matching			Weighted standardized difference
	ACO	Non-ACO	P-value	ACO	Non-ACO	P-value	Before matching	After matching
Number of patients	341,675	1,861,428		341,675	1,024,090
Number of hospitals	427	3,090		427	1,529
Age, mean (years)	74.9	75.0	0.001	74.9	75.0	< 0.001	−0.0064	−0.0154
Male, %	42.0	42.4	< 0.001	42.0	42.9	< 0.001	−0.0096	−0.0179
White race, %	92.2	91.5	< 0.001	92.2	92.0	< 0.001	0.0262	0.0069
Elixhauser Comorbidities (%)
0–1	31.6	33.0	< 0.001	31.6	31.2	< 0.001	−0.0299	0.0078
2	26.1	26.9	< 0.001	26.1	26.2	0.400	−0.0163	−0.0017
≥ 3	42.3	40.1	< 0.001	42.3	42.5	0.003	0.043	−0.0058