Table 1.
Training and testing statistics of the AKI case study
| 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 |
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
*Categorized versions to illustrate training–testing consistency of the variables even after categorization