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Table 1 Training and testing statistics of the AKI case study

From: A pattern-discovery-based outcome predictive tool integrated with clinical data repository: design and a case study on contrast related acute kidney injury

  Training (N = 1791) Testing (N = 769) P value
Age, mean (SD), years 64.37 (11.07) 64.21 (11.00) 0.742
Age (> 60)*, n(%) 1104 (61.6%) 488 (63.5%) 0.413
Male, n (%) 1189 (66.4%) 516 (67.1%) 0.769
Anemia, n (%) 33 (1.8%) 27 (3.5%) 0.016
Diabetes, n (%) 783 (43.7%) 345 (44.8%) 0.623
Heart Failure, n (%) 127 (7.1%) 63 (8.2%) 0.372
Hypotension, n (%) 20 (1.1%) 8 (1.0%) 0.970
MI history, n (%) 127 (7.1%) 49 (6.4%) 0.566
Hypercholesterolemia, n (%) 1542 (86.1%) 683 (88.8%) 0.071
Urgent PCI, n (%) 204 (11.4%) 114 (14.8%) 0.019
Hypertension, n (%) 1251 (69.8%) 553 (71.9%) 0.612
IABP, n (%) 4 (0.5%) 12 (0.7%) 0.867
Contrast volume, mean (SD), mL 135.23 (71.17) 124.46 (63.90)  < 0.001
GFR, mean (SD), ml/min 77.76 (26.44) 82.56 (26.86) 0.248
HDL-C, mean (SD), mmol/L 1.02 (0.26) 1.02 (0.25) 0.784
Pre peak creatinine, mean (SD), μmol/L 109.78 (18.80) 106.76 (19.58) 0.558
LVEF, mean (SD), % 66.27 (11.37) 66.36 (10.96) 0.841
LVEF (≤ 45%)*, n (%) 103 (5.7%) 44 (5.7%) 0.949
AKI, n (%) 149 (8.3%) 40 (5.2%) 0.007
  1. SD, standard deviation; MI, myocardial infarction; PCI, percutaneous coronary intervention; IABP, intra-aortic balloon pump; GFR, glomerular filtration rate; HDL-C, high density lipoprotein cholesterol; LVEF, left ventricular ejection fraction; AKI, acute kidney injury
  2. *Categorized versions to illustrate training–testing consistency of the variables even after categorization