Table 1 Baseline characteristics for patients with missing data versus those without missing data at 6 months

Gender (female), n (%)

35 (67.3%)

184 (65.2%)

0.87

Age

71.0 (6.8)

70.9 (8.3)

0.92

 Appropriate

31 (59.6%)

142 (50.4%)

 Inappropriate

9 (17.3%)

50 (17.7%)

0.40

 Uncertain

12 (23.1%)

90 (31.9%)

 Pain

52.02 (19.30)

53.61 (19.17)

0.58

 Stiffness

53.85 (25.43)

53.01 (25.57)

0.83

 Function

57.87 (19.20)

57.59 (19.33)

0.92

 PCS

26.71 (7.55)

28.17 (7.00)

0.19

 MCS

46.00 (15.02)

45.04 (14.80)

0.68

  Pain level while sitting^a

3.76 (2.0)

3.44 (2.1)

0.78

  Pain level while lying in bed^a

4.08 (2.1)

3.60 (2.1)

0.26

  Function while getting out of bed^a

2.49 (2.1)

2.17 (1.7)

0.90

  Function performing household duties^a

2.40 (1.7)

2.09 (1.5)

0.18

  Function performing leisure activities^a

1.76 (1.7)

1.63 (1.6)

0.67

  Total satisfaction score (range 0–40)

14.4 (7.7)

12.9 (6.8)

0.18