Table 1

Demographic and encounter characteristics

	Overall study cohort
	Readmitted								p Value
	(A) All readmitted		(A1) Hypo		(A2) Non-hypo		(B) Not readmitted		(A) vs (B)
	n=1095		n=158		n=937		n=3381
	n	Per cent	n	Per cent	n	Per cent	n	Per cent	p Value
Age at admission, years
6–17	11	1.0	0	0.0	11	1.2	54	1.6	<0.001
18–24	18	1.6	1	0.6	17	1.8	79	2.3
25–34	77	7.0	11	7.0	66	7.0	151	4.5
35–44	118	10.8	29	18.4	89	9.5	260	7.7
45–54	190	17.4	28	17.7	162	17.3	503	14.9
55–64	220	20.1	35	22.2	185	19.7	712	21.1
65–74	194	17.7	24	15.2	170	18.1	724	21.4
≥75	267	24.4	30	19.0	237	25.3	898	26.6
Gender
Male	547	50.0	89	56.3	458	48.9	1588	47.0	0.104
Female	548	50.0	69	43.7	479	51.1	1793	53.0	0.104
Race
Caucasian	530	48.4	65	41.1	465	49.6	1783	52.7	<0.001
African-American	474	43.3	85	53.8	389	41.5	1251	37.0
Asian	2	0.2	0	0.0	2	0.2	42	1.2
Other known	78	7.1	7	4.4	71	7.6	251	7.4
Unknown	11	1.0	1	0.6	10	1.1	54	1.6
Payer type
Commercial	129	11.8	22	13.9	107	11.4	516	15.3	<0.001
Medicare	513	46.8	65	41.1	448	47.8	1531	45.3
Medicaid	180	16.4	32	20.3	148	15.8	388	11.5
Self-paid	37	3.4	3	1.9	34	3.6	176	5.2
Other	55	5.0	12	7.6	43	4.6	160	4.7
Unknown	181	16.5	24	15.2	157	16.8	610	18.0
90-day pre-exposure to healthcare facility*	530	48.4	83	52.5	447	47.7	877	25.9	<0.001
Discharge disposition
Acute care facility	20	1.8	1	0.6	19	2.0	44	1.3	<0.001
SNF/NH	107	9.8	10	6.3	97	10.4	190	5.6
Home	852	77.8	122	77.2	730	77.9	2755	81.5
Other	28	2.6	0	0.0	28	3.0	75	2.2
Unknown	88	8.0	25	15.8	63	6.7	317	9.4
Diabetes type
Type 1	361	33.0	68	43.0	293	31.3	921	27.2	0.001
Type 2	734	67.0	90	57.0	644	68.7	2460	72.8	0.001
Reference encounter type
ER (without in-pt)	740	67.6	117	74.1	623	66.5	2498	73.9	<0.001
In-pt (with/without ER)	355	32.4	41	25.9	314	33.5	883	26.1	<0.001
ICU exposure ≤48 h after admission	56	5.1	9	5.7	47	5.0	99	2.9	0.001

*Signifies hospital, nursing home or long-term care exposure within 90 days, or transfer from hospice.
ER, emergency room; ICU, intensive care unit; in-pt, inpatient; NH, nursing home; SNF, skilled nursing facility.