Table 1.

Patient demographics, hospital characteristics, and most common comorbidities in patients admitted for skin disease. Odds ratios presented are unadjusted from bivariate logistic regression.

Abbreviations: CY, calendar year; Hosp, hospitalizations; RR, readmission rate; OR, odds ratio; Ref, reference variable

		30 day all cause readmission			30 day same cause readmission			CY same cause readmission
	Hosp, N	RR, %	OR (99% CI)	P	RR, %	OR (99% CI)	P	RR, %	OR (99% CI)	P
All	3602599	9.8			3.3			8.4
Age
0–17 (Ref)	353009	4.8	1	Ref	2.5	1	Ref	4.4	1	Ref
18–44	960053	8.1	1.75 (1.71, 1.79)	<0.001	3.7	1.49 (1.45, 1.54)	<0.001	8.4	2.00 (1.96, 2.05)	<0.001
45–64	1197423	10.4	2.29 (2.24, 2.34)	<0.001	3.7	1.48 (1.44, 1.53)	<0.001	9.0	2.16 (2.11, 2.21)	<0.001
65–84	827838	12.0	2.70 (2.64, 2.77)	<0.001	2.9	1.14 (1.10, 1.18)	<0.001	7.4	1.74 (1.70, 1.79)	<0.001
85+	264276	13.3	3.03 (2.95, 3.11)	<0.001	2.7	1.05 (1.00, 1.09)	0.0073	6.4	1.50 (1.45, 1.54)	<0.001
Sex
Male (Ref)	1852428	8.9	1	Ref	3.1	1	Ref	7.1	1	Ref
Female	1750171	10.8	1.23 (1.22, 1.24)	<0.001	3.6	1.20 (1.18, 1.22)	<0.001	8.6	1.23 (1.22, 1.25)	<0.001
Insurance
Private (Ref)	923454	6.8	1	<Ref	2.6	1	Ref	5.7	1	Ref
Medicare	1395910	13.0	2.04 (2.01, 2.07)	<0.001	3.4	1.31 (1.28, 1.34)	<0.001	8.7	1.57 (1.55, 1.59)	<0.001
Medicaid	721926	10.2	1.55 (1.52, 1.57)	<0.001	4.4	1.73 (1.69, 1.77)	<0.001	9.7	1.77 (1.74, 1.80)	<0.001
Self-pay	346045	5.8	0.85 (0.83, 0.87)	<0.001	2.9	1.11 (1.08, 1.15)	<0.001	6.5	1.14 (1.12, 1.17)	<0.001
Other	205647	7.4	1.09 (1.07, 1.12)	<0.001	3.2	1.24 (1.19, 1.29)	<0.001	7.2	1.27 (1.24, 1.30)	<0.001
Zip code income quartile
4th (Ref)	654372	9.9	1	Ref	3.3	1	Ref	7.6	1	Ref
3rd	795949	9.9	1.01 (0.99, 1.02)	0.21	3.4	1.03 (1.01, 1.06)	<0.0019	7.8	1.03 (1.02, 1.05)	<0.001
2nd	902011	9.8	0.99 (0.98, 1.01)	0.12	3.3	1.00 (0.97, 1.02)	0.63	7.8	1.04 (1.02, 1.06)	<0.001
1st	1187259	9.7	0.98 (0.97, 1.00)	0.0042	3.3	1.01 (0.99, 1.04)	0.13	8.0	1.07 (1.05, 1.08)	<0.001
Hospital bed size
Small (Ref)	526826	8.7	1	Ref	3.3	1	Ref	7.8	1	Ref
Medium	893008	9.5	1.10 (1.09, 1.12)	<0.001	3.2	1.00 (0.97, 1.02)	0.63	7.7	0.99 (0.97, 1.00)	0.045
Large	2182765	10.2	1.20 (1.18, 1.22)	<0.001	3.4	1.05 (1.02, 1.07)	<0.001	<0.001	1.02 (1.01, 1.04)	<0.001
Hospital location
Non-urban (Ref)	161905	7.5	1	Ref	2.7	1	Ref	7.0	1	Ref
Micropolitan	336703	8.7	1.17 (1.14, 1.21)	<0.001	2.8	1.05 (1.00, 1.10)	0.015	7.1	1.00 (0.97, 1.03)	0.93
Small metropolitan	1106347	9.7	1.33 (1.30, 1.37)	<0.001	3.1	1.18 (1.13, 1.23)	<0.001	7.3	1.04 (1.01, 1.07)	<0.001
Large metropolitan	1997645	10.3	1.42 (1.38, 1.45)	<0.001	3.6	1.36 (1.31, 1.42)	<0.001	8.3	1.20 (1.17, 1.23)	<0.001
Hospital teaching status
Non-metropolitan (Ref)	498608	8.3	1	Ref	2.8	1	Ref	7.1	1	Ref
Metropolitan non-teaching	1337382	9.7	1.19 (1.17, 1.21)	<0.001	3.2	1.17 (1.14, 1.21)	<0.001	7.8	1.12 (1.10, 1.14)	<0.001
Metropolitan teaching	1766609	10.4	1.28 (1.26, 1.30)	<0.001	3.6	1.32 (1.28, 1.35)	<0.001	8.1	1.16 (1.14, 1.18)	<0.001
Comorbidities
Hypertension	1271067	10.5	1.12 (1.11, 1.13)	<0.001	3.5	1.09 (1.07, 1.10)	<0.001	8.6	1.18 (1.17, 1.19)	<0.001
Hyperlipidemia	682989	11.3	1.21 (1.20, 1.22)	<0.001	3.2	0.94 (0.92, 0.96)	<0.001	7.9	1.00 (0.99, 1.02)	0.61
Smoking	676758	8.9	0.88 (0.87, 0.89)	<0.001	3.8	1.17 (1.14, 1.19)	<0.001	8.7	1.15 (1.13, 1.16)	<0.001
Type 2 diabetes	605064	11.8	1.29 (1.27, 1.30)	<0.001	3.5	1.08 (1.06, 1.10)	<0.001	9.2	1.23 (1.21, 1.24)	<0.001
Methicillin resistant Staph aureus	454470	6.5	0.60 (0.59, 0.61)	<0.001	2.1	0.57 (0.56, 0.59)	<0.001	6.0	0.72 (0.71, 0.73)	<0.001
Reflux	422415	12.3	1.34 (1.32, 1.36)	<0.001	3.8	1.15 (1.12, 1.17)	<0.001	9.1	1.20 (1.19, 1.22)	<0.001
Morbid obesity	364720	12.5	1.37 (1.35, 1.39)	<0.001	4.9	1.59 (1.56, 1.63)	<0.001	13.8	2.07 (2.04, 2.10)	<0.001
Hypothyroidism	342772	12.9	1.41 (1.39, 1.43)	<0.001	3.8	1.15 (1.12, 1.18)	<0.001	9.4	1.24 (1.22, 1.26)	<0.001
Depression	323816	12.5	1.35 (1.33, 1.37)	<0.001	4.1	1.27 (1.24, 1.31)	<0.001	10.3	1.39 (1.37, 1.41)	<0.001
Congestive heart failure	318282	17.5	2.13 (2.10, 2.16)	<0.001	3.8	1.17 (1.14, 1.20)	<0.001	10.3	1.39 (1.37, 1.41)	<0.001