Table 1 Characteristics of the training and test datasets

n

24

90

-

10

40

-

-

Age (year), median (IQR)

46.50 (44.50–55.00)

56.00 (50.00–70.00)

<0.01

47.50 (42.50–53.25)

59.00 (51.25–64.00)

<0.01

0.58

Gender, n (%)

0.63

0.56

0.08

Male

5 (20.8)

23 (25.6)

3 (30)

16 (40)

Female

19 (79.2)

67 (74.4)

7 (70)

24 (60)

Side, n (%)

<0.01

0.48

0.65

Right

7 (29.2)

57 (63.3)

5 (50)

25 (62.5)

Left

17 (70.8)

33 (36.7)

5 (50)

15 (37.5)

BMI (kg/m²), mean ± SD

22.36 ± 2.35

24.69 ± 2.46

<0.01

21.30 ± 1.43

25.11 ± 2.05

<0.01

0.74

KL-score, n (%)

<0.01

<0.01

0.58

KL-0

1 (4.2)

0

1 (10)

0

KL-1

23 (95.8)

0

9 (90)

0

KL-2

0

57 (63.4)

0

30 (75)

KL-3

0

22 (24.4)

0

4 (10)

KL-4

0

11 (12.2)

0

6 (15)

Rad-score, median (IQR)

0.41 ( -0.34–1.11)

2.01 (1.47–2.70)

<0.01

0.63 (0.16–1.44)

2.31 (1.22–2.87)

<0.01

0.85