Skip to main content

Table 1 Summary of patient data

From: Identifying factors predicting prolonged rehabilitation after simultaneous bilateral total knee arthroplasty: a retrospective observational study

All patients (n = 191)

Compliance group (n = 132)

Delayed group (n = 59)

P-value

Age, years

  < 60

4

1

 

 60–70

26

6

 

 70–80

76

25

 

 80–90

26

27

 

 Average

74.2

77.9

< 0.001a

Female, %

83.3%

88.1%

0.393b

Body mass index, kg/m2

  < 20

3

0

 

 20–25

38

20

 

 25–30

66

22

 

 30–35

22

13

 

  > 35

3

4

 

 Average

27.1

27.7

0.706 c

Living alone, %

15.9%

27.1%

0.077b

Knee Society score

 Walking

24.5

22.7

0.138 c

 Stairs

27.1

23.2

0.061 c

 Walking aids used

3.5

5.0

0.043 c

 Total

48.1

41.6

0.057 c

ASA class

 I

11

2

 

 II

119

51

 

 III

2

6

 

 Average

1.93

2.07

0.009 c

Hemoglobin, g/dL

13.1

12.6

0.014a

Albumin, g/dL

4.4

4.3

0.018a

Mean range of motion

 Extension

12.7

12.3

0.704 c

 Flexion

113.4

114.5

0.964 c

Mean K–L grade

3.86

3.89

0.753 c

Length of stay (days, excluding transferred cases)

18.5

23.6

< 0.001 c

Transferred cases, number

0

13

 
  1. Values are presented as mean. P-values were obtained using the Mann–Whitney U test or chi-square test
  2. n number, ASA American society of anesthesiologists, K–L grade Kellgren–Lawrence classification
  3. aNon-paired t-test
  4. bchi-square test
  5. cMann–Whitney U test