Table 2 Baseline characteristics and preoperative PROMs

Knees, n

60

50

110

–

Age, mean (SD)

66 (9)

63 (8)

65 (9)

0.18 ^a

BMI, mean (SD)

28.3 (5.9)

28.9 (4.2)

28.5 (5.1)

0.54 ^a

Gender, n (%)

0.62

 Female

29 (58.0)

32 (53.3)

61 (55.5)

 Male

21 (42.0)

28 (46.7)

49 (44.5)

ASA classification, n (%)

0.72

 I

9 (18.0)

7 (13.5)

16 (15.7)

 II

40 (80.0)

43 (82.7)

83 (81.4)

 III

1 (2.0)

2 (3.8)

3 (2.9)

Smoking, n (%)

0.42

 Yes

6 (12.0)

10 (17.5)

16 (15.0)

 No

44 (88.0)

47 (82.5)

91 (85.0)

Knee flexion (°), median (IQR)

125.0 (102.0; 140.0)

110.0 (100.0; 120.0)

120.0 (100.0; 126.0)

< 0.01^b

Operation time (minutes), mean (SD)

63.0 (17.0)

56.9 (10.5)

60.4 (14.7)

0.02^a

Total hospital stay (days), median (IQR)

3.0 (3.0; 4.0)

3.0 (2.0; 3.0)

3.0 (3.0; 4.0)

< 0.01^b

 OKS, mean (SD)

28 (7)

26 (8)

27 (8)

0.22 ^a

 EQ5D, median (IQR)

0.78 (0.66; 0.81)

0.81 (0.63; 0.81)

0.81 (0.65; 0.81)

0.81 ^b

 EQ5D%, median (IQR)

80.0 (70.0; 90.0)

76.0 (65.0; 90.0)

78.0 (69.0; 90.0)

0.37 ^b