Table 1 Baseline characteristics of the study cohort.

From: Outcome prediction for acute kidney injury among hospitalized children via eXtreme Gradient Boosting algorithm

Characteristics

Cohort (n = 1394)

Age, yr

4 (0–11)

Age categories, n (%)

Infancy, 1 mo−1 yr

504 (36.2)

Childhood, 2–10 yr

502 (36.0)

Adolescent, 11–18 yr

388 (27.8)

Sex, male, n (%)

817 (58.6)

AKI type, n (%)

Community-acquired AKI

343 (24.6)

Hospital-acquired AKI

1051 (75.4)

AKI stage, n (%)

Stage 1

844 (60.5)

Stage 2

319 (22.9)

Stage 3

231 (16.6)

Clinical settings, n (%)

 

Sepsis

181 (13.0)

Glomerulonephritis

57 (4.1)

Nephrotic syndrome

156 (11.2)

CKDa

15 (1.1)

Urinary tract obstruction/malformation

25 (1.8)

Non-cardiac surgery

72 (5.2)

Congenital heart disease/cardiac surgery

451 (32.4)

Heart failure

114 (8.2)

Inherited metabolic disease

24 (1.7)

Cardiac arrest

12 (0.9)

Trauma/burn

27 (1.9)

Shock

61 (4.4)

Respiratory failure

120 (8.6)

Diarrhea/dehydration

56 (4.0)

Nephrotoxic drugs

673 (48.3)

Laboratory data

Hemoglobin, g/L

111 (92–126)

 < 90

313 (22.5)

White blood cells, × 109/L

9.4 (5.7–14.6)

 < 4

227 (16.3)

 > 10

649 (46.6)

Platelets, × 109/L

229 (138–345)

 < 100

239 (17.1)

Proteinuria, n (%)

261 (22.7)

Serum albumin, g/L

36.8 (30.3–41.0)

 < 30

332 (23.9)

Serum total bilirubin, μmol/L

9.5 (5.2–18.2)

 > 34.2

156 (11.2)

Serum potassium, mmol/L

4.4 (3.9–4.9)

 < 3.5

144 (10.5)

 > 5.5

89 (6.5)

Serum sodium, mmol/L

138 (136–140)

 < 135

271 (19.9)

 > 145

56 (4.1)

Loop diuretics, n (%)

736 (52.8)

Mechanical ventilation, n (%)

274 (19.7)

RRT, n (%)

105 (7.5)

  1. AKI acute kidney injury, CKD chronic kidney disease, RRT renal replacement therapy.
  2. Continuous variables are presented as median (interquartile range) and categorical variables are presented as n (%).
  3. Missing data: proteinuria (n = 245, 17.6%), serum albumin (n = 4, 0.3%), serum total bilirubin (n = 7, 0.5%), serum potassium (n = 29, 2.1%) and serum sodium (n = 29, 2.1%).
  4. aAdmission or discharge diagnoses included CKD stage 3–4, identified by ICD-10 codes (N18.803 and N18.804).