Table 1.

Patient and hospital characteristics at safety net and non-safety net hospital admission: 30-day readmission cohort

	Total (n=83367)	Safety Net (n=17791)	Non-Safety Net (n=65576)	p-value
Cancer, n (%)
Benign	33886	7958 (44.73)	25928 (39.54)	<0.0001
Malignant	49481	9833 (55.27)	39648 (60.46)
Age, n (%)
18–44	15521	3637 (20.44)	11884 (18.12)	<0.0001
45–59	28293	6200 (34.85)	22093 (33.69)
60–74	30184	6261 (35.19)	23923 (36.48)
≥75	9369	1693 (9.52)	7676 (11.71)
Gender, n (%)
Male	38124	8034 (45.16)	30090 (45.89)	0.08
Female	45243	9757 (54.84)	35486 (54.11)
Primary Insurance, n (%)
Medicare	29323	5926 (33.31)	23397 (35.68)	<0.0001
Medicaid	8767	3513 (19.75)	5254 (8.01)
Private insurance	39309	6355 (35.72)	32954 (50.25)
Self-pay	2472	905 (5.09)	1567 (2.39)
No charge	307	129 (0.73)	178 (0.27)
Other	2966	914 (5.14)	2052 (3.13)
Missing	223	49 (0.28)	174 (0.27)
Median Household Income*, n (%)
0–25 percentile	17077	5597 (31.46)	11480 (17.51)	<0.0001
26–50 percentile	18402	4309 (24.22)	14093 (21.49)
51–75 percentile	21217	4250 (23.89)	16967 (25.87)
76–100 percentile	25026	3254 (18.29)	21772 (33.20)
Missing	1645	381 (2.14)	1264 (1.93)
All Patient Refined DRG: Severity of Illness Subclass, n (%)
No class	DS**	DS**	DS**	<0.0001
Minor	20722	4249 (23.88)	16473 (25.12)
Moderate	33193	6860 (38.56)	26333 (40.16)
Major	22062	4883 (27.45)	17179 (26.20)
Extreme	7388	1798 (10.11)	5590 (8.52)
Index Length of Stay, n (%)
0–3 days	27537	4811 (27.04)	22726 (34.66)	<0.0001
4–5 days	16357	3294 (18.51)	13063 (19.92)
6–10 days	20402	4619 (25.96)	15783 (24.07)
>10 days	19071	5067 (28.48)	14004 (21.36)
Major Complication, n (%)
Yes	3532	853 (4.79)	2679 (4.09)	<0.0001
No	79835	16938 (95.21)	62897 (95.91)
Neurological Complication, n (%)
Yes	16724	3621 (20.35)	13103 (19.98)	0.27
No	66643	14170 (79.65)	52473 (80.02)
Disposition, n (%)
Routine	53686	11715 (65.85)	41971 (64.00)	<0.0001
Other	29639	6059 (34.06)	23580 (35.96)
Missing	42	17 (0.10)	25 (0.04)
Hospital Bed Size, n (%)
Small	4535	265 (1.49)	4270 (6.51)	<0.0001
Medium	12350	2524 (14.19)	9826 (14.98)
Large	66482	15002 (84.32)	51480 (78.50)
Hospital Teaching Status, n (%)
Teaching	67093	15992 (89.89)	51101 (77.93)	<0.0001
Non-teaching	16274	1799 (10.11)	14475 (22.07)
Hospital Volume, n (%)
>90th percentile	42044	8945 (50.28)	33099 (50.47)	0.64
≤90th percentile***	41323	8846 (49.72)	32477 (49.53)
HCUP Used Emergency, n (%)
Yes	25170	6418 (36.07)	18752 (28.60)	<0.0001
No	58197	11373 (63.93)	46824 (71.4)
Hospital Urban-Rural Designation, n (%)
Metropolitan	57814	10883 (61.17)	46931 (71.57)	<0.0001
Other	25553	6908 (38.83)	18645 (28.44)
Control/Ownership of Hospital, n (%)
Government, non-federal	14477	6873 (38.63)	7604 (11.60)	<0.0001
Private, non-profit	62819	9800 (55.08)	53019 (80.85)
Private, investor-owned	6071	1118 (6.28)	4953 (7.55)

^*For patient’s ZIP code, based on current year.

^**Data suppressed for patient confidentiality

^***103 procedures / year