Skip to main content

Table 2 Single-factor chi-square analysis of preoperative variables (N = 167)

From: Factors associated with the length of stay in total knee arthroplasty patients with the enhanced recovery after surgery model

Factors

Classification

Number

Percent

Mean ± SD

F value

P value

Pre-operation Hb (g/L)

Hb < 100

5

3.00

20.00 ± 5.79

5.457

0.104

100 ≤ Hb < 110

13

7.80

22.08 ± 10.17

110 ≤ Hb < 120

23

13.80

21.74 ± 7.09

120 ≤ Hb < 130

52

31.10

17.29 ± 4.68

130 ≤ Hb < 140

46

27.50

18.87 ± 7.60

140 ≤ Hb

28

16.80

19.21 ± 4.98

Pre-operation albumin (g/L)

< 30

2

1.20

33.50 ± 4.95

4.675

0.002

≥ 30

165

98.80

18.94 ± 6.48

Pre-operation ESR (mm/h)

< 15

77

46.10

17.71 ± 5.22

6.560

0.011

≥ 15

90

53.90

20.31 ± 7.47

Pre-operation CRP (mg/L)

< 5

44

26.30

18.55 ± 6.48

0.371

0.691

≥ 5

122

73.70

19.29 ± 6.73

Primary disease

RA

16

9.60

23.50 ± 7.80

8.050

0.005

OA

151

90.40

18.65 ± 6.36

Merge disease

No

112

67.10

18.36 ± 5.96

4.509

0.035

Yes

55

32.90

20.65 ± 7.68

ASA class

1

38

22.80

16.61 ± 5.17

3.844

0.023

2

120

71.90

19.75 ± 6.53

3

9

5.40

21.22 ± 10.76

  1. Hb hemoglobin, ESR erythrocyte sedimentation, CRP C-reactive protein, ASA American Society of Anesthesiologists