Table 1 Comparison of clinical data between training cohort and validation cohort

Gender(n,%)

0.507

Male

51(67.1)

25(32.9)

22(62.9)

13(37.1)

Female

15(75.0)

5(25.0)

4(57.1)

3(42.9)

Affected side(n,%)

0.307

Left

36(63.2)

21(36.8)

13(61.9)

8(38.1)

Right

30(76.9)

9(23.1)

13(61.9)

8(38.1)

Exposure(n,%)

0.857

Yes

8(30.8)

18(69.2)

6(50.0)

6(50.0)

No

58(82.9)

12(17.1)

20(66.7)

10(33.3)

Etiology(n,%)

Glucocorticoids

31(77.5)

9(22.5)

12(57.1)

9(42.9)

Alcohol

9(45.0)

11(55.0)

5(100.0)

0(0.0)

Traumatic

25(73.5)

9(26.5)

7(53.8)

6(46.2)

Idiopathic

1(50.0)

1(50.0)

2(66.7)

1(33.3)

ARCO(n,%)

0.480

IIA

48(72.7)

18(27.3)

23(69.7)

10(30.3)

IIB

16(61.5)

10(38.5)

3(37.5)

5(62.5)

III

2(50.0)

2(50.0)

0(0.0)

1(100.0)

JIC classification(n,%)

0.232

Type B

21(95.5)

1(4.5)

11(84.6)

2(15.4)

Type C1

33(64.7)

18(35.3)

14(58.3)

10(41.7)

Type C2

12(52.2)

11(47.8)

1(20.0)

4(80.0)

Age(years,M ± SD)

37.70 ± 12.31

44.33 ± 11.14

40.42 ± 10.38

43.25 ± 9.21

Nonbearing(months,M ± SD)

4.26 ± 1.48

3.53 ± 1.28

4.27 ± 1.51

4.69 ± 1.54

Progress(months,M ± SD)

5.82 ± 7.81

5.67 ± 4.86

5.96 ± 13.60

4.11 ± 5.57

Harris(score,M ± SD)

70.44 ± 9.11

71.77 ± 10.81

70.50 ± 9.42

66.31 ± 15.02

BMI(kg/m2,M ± SD)

23.86 ± 2.31

23.97 ± 1.77

22.95 ± 1.57

23.75 ± 2.57

D-dimer(mg/L, M ± SD)

0.39 ± 0.29

0.71 ± 0.93

0.68 ± 1.60

0.63 ± 0.54

WBC(× 109/L,M ± SD)

7.14 ± 1.74

6.81 ± 1.26

6.80 ± 0.92

7.10 ± 0.91

N(%, M ± SD)

62.12 ± 9.83

63.16 ± 10.56

59.46 ± 9.26

58.52 ± 15.97

ALP(U/L, M ± SD)

94.39 ± 26.46

90.80 ± 24.96

87.65 ± 25.75

100.3 ± 28.46

AFU(U/L, M ± SD)

17.37 ± 6.05

18.25 ± 8.15

16.36 ± 5.72

20.34 ± 9.12