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Table 1 Patient Characteristics and baseline variables stratified by datasets

From: Development and validation of a risk nomogram for postoperative acute kidney injury in older patients undergoing liver resection: a pilot study

Variables

Training

(n = 599)

Validation

(n = 244)

P Value

Age, years

69 (66, 72)

69 (66, 73)

0.36

Sex (Male), n (%)

385 (64.3)

168 (68.9)

0.23

BMI, kg·m− 2

23.6 (21.6, 25.7)

23.5 (20.9, 26.0)

0.68

Hypertension, n (%)

230 (38.4)

89 (36.5)

0.64

Diabetes, n (%)

109 (18.2)

48 (19.7)

0.63

Cardiovascular diseases, n (%)

80 (13.4)

43 (17.6)

0.13

CKD, n (%)

26 (4.3)

6 (2.5)

0.24

Pulmonary diseases, n (%)

32 (5.3)

12 (4.8)

0.87

Hepatitis/ cirrhosis, n (%)

125 (20.9)

49 (20.1)

0.85

ASA PS, n (%)

  

0.77

 I-II

491 (82.0)

203 (83.2)

 III-IV

108 (18.0)

41 (16.8)

Pathology, n (%)

  

0.13

 Hepatoma

383 (63.9)

154 (63.1)

 Cholangiocarcinoma

82 (13.7)

46 (18.9)

 Hepatic Metastasis

16 (2.7)

8 (3.3)

 Benign

118 (19.7)

36 (14.8)

Hemoglobin, g·L− 1

131 (120, 142)

130 (119, 140)

0.34

Albumin, g·L− 1

39.0 (36.1, 41.6)

39.0 (36.8, 41.4)

0.71

Total bilirubin, μmol·L−1

13.1 (9.2, 19.6)

12.6 (9.7, 19.7)

1.00

Direct bilirubin, μmol·L−1

4.3 (3.0, 7.5)

4.3 (3.0, 7.7)

0.90

Fasting blood glucose, μmol·L−1

5.04 (4.58, 5.83)

5.12 (4.62, 5.96)

0.51

Creatinine, μmol·L−1

68.4 (59.0, 79.2)

66.1 (58.5, 76.8)

0.29

eGFR, ml·min·1.73 m−2

89.8 (80.8, 94.4)

90.1 (84.5, 95.2)

0.11

  1. Notes: Continuous data are shown as medians (quartiles) and compared using Wilcoxon rank-sum test. Categorical variables are shown as frequencies (percentages) and compared using the chi-squared test or Fisher’s exact test as appropriate
  2. Abbreviations: ASA PS American Society of Anesthesiologists physical score, BMI Body mass index, CKD Chronic kidney disease; eGFR, estimated glomerular filtration rate