Table 1.

Study Population of Inpatient Discharges Age 18–64 in Massachusetts, New Jersey, New York, and Pennsylvania, 1/1/2004–6/30/2010

	Massachusetts		Control States
	Safety‐Net Hospitals	Non‐Safety‐Net Hospitals	Safety‐Net Hospitals	Non‐Safety‐Net Hospitals
No. of hospitals	16	48	107	327
No. of discharges	960,269	1,573,550	5,247,415	11,178,273
Patient age, %
18–44	52.4	50.1	53.2	48.4
45–54	23.5	23.4	24.0	24.0
55–64	24.1	26.5	22.7	27.6
Race/ethnicity, %
Whites, non‐Hispanic & Others	73.8	87.7	51.7	78.2
Blacks, non‐Hispanic	12.7	6.1	32.4	13.7
Hispanic	13.5	6.2	15.9	8.1
Income, Zip code median, %
Low	50.5	19.9	50.6	22.6
Medium	22.6	25.6	22.8	25.9
High	26.9	54.5	26.6	51.5
Outcomes
Mean discharge volume, quarterly	2,308	1,261	1,886	1,307