Hospital acquired Acute Kidney Injury is associated with increased mortality but not increased readmission rates in a UK acute hospital

Table 4 Cox regression for readmission within 90 days for AKI or no AKI and adjusted for age, gender, co-morbidity (Diabetes Mellitus; hypertension; heart failure; vascular disease; malignancy; composite of infection; composite of GI blood loss or hypovolemia) and CRP

	Hazard Ratio	95% Confidence intervals		P value
		Lower	Upper
AKI	0.921	0.787	1.078	0.304
Male gender	0.932	0.891	0.974	0.002
Age (reference [18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35] years)
Age 36–45	1.076	0.983	1.178	0.113
Age 46–55	1.254	1.151	1.366	<0.001
Age 56–65	1.261	1.159	1.374	<0.001
Age 66–75	1.441	1.325	1.567	<0.001
Age > 75	1.784	1.656	1.921	<0.001
Diabetes Mellitus	1.186	1.108	1.269	<0.001
Hypertension	0.939	0.888	0.994	0.029
Ischaemic Heart Disease	1.107	1.011	1.212	0.028
Heart Failure	1.372	1.234	1.527	0.000
Vascular Disease	1.194	0.983	1.450	0.073
Malignancy	2.112	1.975	2.258	<0.001
Composite of Infection	1.149	1.057	1.249	0.001
Liver Disease	1.776	1.556	2.027	<0.001
Composite of GI Blood Loss or Hypovolaemia	1.259	1.116	1.420	<0.001
CRP (referenced to CRP < 11)
Unmeasured	1.010	0.915	1.115	0.848
11–20	1.069	0.950	1.204	0.267
21–30	1.051	0.920	1.200	0.463
31–40	1.107	0.960	1.276	0.163
41–50	1.139	0.983	1.320	0.084
51–60	1.092	0.931	1.282	0.279
61–70	1.137	0.962	1.344	0.132
71–80	1.069	0.899	1.272	0.450
81–90	.930	0.762	1.134	0.471
91–100	1.068	0.957	1.191	0.238
101–150	1.087	0.957	1.235	0.199
151–200	1.096	0.957	1.255	0.186
201–250	1.088	0.918	1.290	0.332
251–300	0.763	0.611	0.954	0.018
301–350	1.327	1.020	1.726	0.035
351–400	0.843	0.788	0.902	<0.001
> 400	1.042	0.788	1.378	0.773

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