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Table 1 Baseline characteristics

From: Validation of administrative database codes for acute kidney injury in kidney transplant recipients

Total n = 524  
Demographics  
 Mean age (SD), years 57.7 (12.1)
Age (n (%))  
 18 to <35 23 (4.4)
 35 to <60 262 (50)
 60 to <70 151 (28.8)
 ≥70 88 (16.8)
Women (n (%)) 185 (35.3)
Race (n (%))  
 Caucasian 374 (71.4)
 Asian 15 (2.9)
 Black 19 (3.6)
 Indian subcontinent 12 (2.3)
 Aboriginal 9 (1.7)
 Other 16 (3.1)
 Unknown 34 (6.5)
 Missing 45 (8.6)
Income quintile (n (%))  
 One (lowest) 114 (21.8)
 Two 106 (20.2)
 Three 102 (19.5)
 Four 83 (15.8)
 Five (highest) 119 (22.7)
Rural location (n (%)) 102 (19.5)
Year of cohort entry (n (%))  
 2003–2006 149 (28.4)
 2007–2009 159 (30.4)
 2010–2012 216 (41.2)
Time since transplant, median (IQR), years 3.5 (1.5, 7.1)
Year of kidney transplant (n (%))  
 1988–1992 18 (3.4)
 1993–1997 39 (7.45)
 1998–2002 147 (28.1)
 2003–2007 205 (39.1)
 2008–2012 115 (21.9)
Time on dialysis prior to transplant, median (IQR), years 2.0 (0.9, 3.5)
Time on dialysis prior to transplant (n (%)), years  
 0 to <1 121 (23.1)
 1 to <2 118 (22.5)
 2 to <3 82 (15.7)
 3 to <4 57 (10.9)
 ≥4 98 (18.7)
Cause of end stage renal disease (n (%))  
 Glomerulonephritis 148 (28.2)
 Hypertension 49 (9.4)
 Pyelonephritis/interstitial 35 (6.7)
 Cystic kidney disease 61 (11.6)
 Diabetes 108 (20.6)
 Other 29 (5.5)
 Unknown 94 (17.9)
Type of donor (n (%))  
 Deceased 347 (66.2)
 Living 165 (31.5)
 Missing 12 (2.3)
Comorbidities (n (%))  
 Coronary artery disease 156 (29.8)
 Diabetes 243 (46.4)
 Hypertension 489 (93.3)
 Congestive heart failure 88 (16.8)
 Chronic liver disease 36 (6.9)
 Chronic obstructive pulmonary disease 20 (3.8)
 Peripheral vascular disease 28 (5.3)
 Stroke/transient ischemic attack 12 (2.3)
Baseline laboratory measurements  
 Serum creatinine, median (IQR), umol/L 133.0 (103.0, 173.9)
 eGFR, median (IQR), ml/min/1.73 m2a 46.1 (33.4, 62.8)
eGFR category (n (%)), ml/min/1.73 m2  
 <15 21 (4.0)
 15 to <30 84 (16.0)
 30 to <45 146 (27.9)
 45 to <60 116 (22.1)
 ≥60 157 (30.0)
AKI definitions (n (%))b  
 Any AKI 236 (45.0)
 AKIN stage 1 160 (30.5)
 AKIN stage 2 21 (4.0)
 AKIN stage 3 55 (10.5)
  1. aEstimated glomerular filtration rate (eGFR) was calculated using the CKD-EPI equation [32]
  2. bDefined by serum creatinine