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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

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

  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
  1. AKI acute kidney injury, CRP C-reactive protein