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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