Table 2

30-Day Readmission Rates by Clinical Risk Strata and Outpatient Follow-up Status

Risk Strata: Follow-up Within Indicated Days	Readmission, Receiving Follow-up %	Readmission, Not Receiving Follow-up %	Difference %	P Value
No chronic conditions (<10% readmission risk), n = 14,767^a
3 d	4.7	5.9	1.2	.004
7 d	5.1	6.0	0.9	.006
14 d	4.9	6.4	1.5	<.001
21 d	4.7	7.0	2.3	<.001
30 d	4.5	7.5	3.0	<.001
Single chronic condition (<10% readmission risk), n= 10,027^a
3 d	6.0	6.4	0.4	.511
7 d	6.0	6.6	0.6	.183
14 d	5.8	6.9	1.1	.014
21 d	5.4	7.5	2.1	<.001
30 d	5.1	8.4	3.3	<.001
Multiple chronic conditions (<10% readmission risk), n = 12,777^a
3 d	30	8.9	−0.3	.720
7 d	8.9	9.0	0.1	.522
14 d	7.6	10.2	2.6	<.001
21 d	6.8	11.7	4.9	<.001
30 d	6.2	13.8	7.6	<.001
Multiple chronic conditions (10%–19% readmission risk), n = 11,894^a
3 d	14.9	15.4	0.5	.387
7 d	14.4	15.8	1.4	.004
14 d	12.5	18.3	5.8	<.001
21 d	11.6	20.9	9.3	<.001
30 d	10.7	24.7	14.0	<.001
Multiple chronic conditions (20%–29% readmission risk), n = 9,018^a
3 d	21.5	24.7	3.2	.011
7 d	20.1	26.3	6.2	<.001
14 d	18.5	30.5	12.0	<.001
21 d	17.3	34.8	17.5	<.001
30 d	16.0	40.6	24.6	<.001
Multiple chronic conditions (30%–39% readmission risk), n = 4,552^a
3 d	30.1	32.7	2.6	.129
7 d	27.9	34.5	6.6	<.001
14 d	25.0	40.5	15.5	<.001
21 d	24.1	45.0	20.9	<.001
30 d	22.6	51.2	28.6	<.001
Multiple chronic conditions (≥40% readmission risk), n = 2,050^a
3 d	40.6	43.0	2.4	.144
7 d	37.4	45.1	7.7	<.001
14 d	32.7	51.8	19.1	<.001
21 d	30.6	58.3	27.7	<.001
30 d	28.9	64.3	35.5	<.001