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Table 2 Comparisons of baseline characteristics between groups. The Kruskal-Wallis test was used to compare all variables except gender which was compared with the Fisher’s exact test. Mean (SD) and Median (IQR) values for patient reported outcome measures are shown

From: The clinical outcomes of cementless unicompartmental knee replacement in patients with reduced bone mineral density

Parameter

Normal bone

Osteopenic bone

Osteoporotic bone

Differences between groups for parameter

Mean follow-up (years)

4.7 (SD 2.4)

4.7 (SD 2.5)

6.6 (SD 3)

P = 0.16

Age

62.9 (SD 8.1)

70.4 (SD 9.7)

68 (SD 8.3)

P = 0.01

BMI

30.9 (SD 6.3)

27 (SD 4.5)

27.1 (SD 5.7)

P = 0.06

Gender

15 females, 5 males

34 females, 4 males

11 females, 1 male

P = 0.34

ASA grade

2.25 (SD 0.6)

2.16 (SD 0.5)

2.17 (SD 0.4)

P = 0.76

Preop mean and median OKS

19.3 (SD 7.8), 17 (IQR 11)

23.1 (SD 8.8), 23.5 (IQR 15)

20.4 (SD 7.5), 20.5 (IQR 9)

P = 0.37

Preop mean and median OKS functional subscale score

10 (SD 3.8), 10 (IQR 6)

11 (SD 3.9), 11 (IQR 6)

11.3 (SD 3.7), 12 (IQR 6)

P = 0.58

Preop mean and median OKS pain subscale score

10.5 (SD 5), 10 (IQR 9)

11.1 (SD 5.1), 10 (IQR 7)

11.7 (SD 5.5), 13 (IQR 7)

P = 0.80

Preop mean and median Tegner

1.7 (SD 1.4), 2 (IQR 3)

1.9 (SD 0.9), 2 (IQR 2)

1.5 (SD 1), 1.5 (IQR 1)

P = 0.70

Preop mean and median AKSS-O

48.7 (SD 14.2), 50 (IQR 14)

58 (SD 12.8), 59.5 (IQR 16.5)

50 (SD 14.5), 48 (IQR 11)

P = 0.18

Preop mean and median AKSS-F

62.1 (SD 16.8), 62.5 (IQR 12.5)

65.1 (SD 14.3), 70 (IQR 15)

60 (SD 12.6), 60 (IQR 15)

P = 0.74