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Table 1 Demographics and mortality for hospitalised patients

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

  Total No AKI AKI P value
Number of patients 73,016 71,381 1635 (2.2%)  
Age/years (median (IQR)) 56.8 (38–76) 56.5 (38–76) 71.0 (61–84) <0.001
Male n (%) 38,568 (52.8) 37,706 (53.0) 862 (53) NS
LOS/days (mean, IQR)) 7.55 (1–8) 7.0 (1–7) 31.1 (11–41) <0.001
Mortality at discharge (% of whole population) 2918 (3.9) 2368 (3.3) 550 (33.6) <0.001
Total mortality at 90 Days 5546 (7.6) 4830 (6.8) 689 (42.1) <0.001
Total mortality at 1 year 9088 (12.4) 8301 (11.6) 787 (48.1) <0.001
Number of patients readmitted during follow-up (until censor 30/9/2011) (%) 18,971 (26.0) 18,709 (26.2) 342 (21.0) <0.001
eGFR 1st measurement (ml/min/1.73m2) (median (IQR)) 76.4 (57.2–92.1) 76.5 (57.5–92.2) 73.2 (45–88.5) <0.001
eGFR minimum (ml/min/1.73m2) (median (IQR)) 73.1 (54.3–89.2) 74.1 (55.6–89.8) 33.3 (18.0–41.5) <0.001
eGFR on 1st measurement <45/ml/min/1.73m2 (%) 7281 (10.0) 6872 (9.6) 409 (25.0) <0.001
eGFR minimum <45/ml/min/1.73m2 (%) 4372 (6.0) 4157 (5.8) 215 (13.1) <0.001
Creatinine on first measurement >177 μmol/L (>2 mg/dL)(%) 2290 (3.1) 2137 (3.0) 153 (9.4) <0.001
Creatinine minimum >177 μmol/L (>2 mg/dL)(%) 1022 (1.4) 949 (1.3) 73 (4.5) <0.001
Co-morbidities
 Diabetes mellitus n (%) 7571 (10.4) 7227 (10.0) 344 (21.0) <0.001
 Hypertension n (%) 15,503 (21.2) 14,877 (20.8) 626 (38.3) <0.001
 Ischaemic heart disease n (%) 4001 (5.5) 3832 (5.4) 169 (10.3) <0.001
 Heart failure n (%) 2460 (3.4) 2183 (3.1) 227 (13.9) <0.001
 Vascular disease n (%) 762 (1.0) 715 (1.0) 47 (2.9) <0.001
 Malignancy n (%) 5518 (7.6) 5225 (7.3) 293 (17.9) <0.001
 Composite of Infection n (%) 4920 (6.7) 4457 (6.2) 463 (28.3) <0.001
 Liver Disease n (%) 1351 (1.9) 1167 (1.63) 184 (11.3) <0.001
 Composite of GI blood loss or hypovolemia n (%) 2058 (2.8) 1910 (2.7) 148 (9.1) <0.001
 CRP measurement 30,688 (42) 29,146 (40) 1542 (94) <0.001
 Average CRP (in those who had CRP measured) 88 83 174 <0.001
  1. AKI, acute kidney injury, eGFR estimated glomerular filtration rate, IQR interquartile range, LOS length of stay