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Table 2 Variables selected for machine learning modeling from the clinical datasets

From: Prediction of arrhythmia after intervention in children with atrial septal defect based on random forest

Input variable

Ranges

Input variable

Ranges

Sexa

0–1

Potassium (mmol/L)

3-5.7

Height (m)

0.64–1.30

Sodium (mmol/L)

134–146

Weight (kg)

7–35

CK (U/L)

13.83-276.87

Lung blooda

0–1

CK-MB (U/L)

8–43

Precardiac spacea

0–1

PT (S)

9.8–13.7

CTR

0.4–0.65

INR

0.8–1.19

Right heart enlargementa

0–1

APTT (S)

20.1–31.8

ASD size (mm)

5–22

TT (S)

14-119.6

LVEF (%)

60–73

Fibrinogen (mg/dl)

0.97–3.5

Leukocyte (×109/L)

4-13.88

FDP (µg/ml)

2.5-87.94

Erythrocyte (×109/L)

3.5–5.33

D dimer (mg/L)

0-3.02

Hemoglobin (g/L)

86–152

BMI (kg/m2)

0.19–14.78

Platelets (×109/L)

100–443

BSA (m2)

0.345-1.124

Albumin (g/L)

40-54.98

Operating age (year)

0.50-14.78

ALT (U/L)

5.98–109.6

Creatinine (µmol/l)

4.78-318.69

AST (U/L)

10.21–95.17

Urea (mmol/L)

0.99–7.34

  1. CTR cardiothoracic ratio, LVEF left ventricular ejection fraction, BMI body mass index, BSA Body surface area, ALT alanine transaminase, AST aspartate aminotransferase, INR international normalized ratio, CK creatine kinase, CK-MB creatine kinase-MB, PT prothrombin time, APTT activated partial thromboplastin time, TT thrombin time, FDP fibrin degradation products
  2. acategorical data. Sex: 0 female; 1 male. Lung blood: normal 0; increase 1; Precardiac space: normal 0; decrease 1. Right heart enlargement: false 0; true 1