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Table 1 Baseline characteristics of patients

From: Association between type of anesthesia and length of hospital stay in primary unilateral total knee arthroplasty patients: a single-center retrospective study

Variables

Total (n = 2309)

GA (n = 791)

RA (n = 1518)

P values

Patient demographics

    

Race, n (%)

   

0.019

 Chinese

1945 (84.2)

642 (81.2)

1303 (85.8)

 

 Malay

159 (6.9)

63 (8)

96 (6.3)

 

 Indian

137 (5.9)

61 (7.7)

76 (5)

 

 Others

68 (2.9)

25 (3.2)

43 (2.8)

 

Gender, n (%)

   

0.003

 Female

1746 (75.6)

628 (79.4)

1118 (73.6)

 

 Male

563 (24.4)

163 (20.6)

400 (26.4)

 

BMI (Kg/m2)

27.8 ± 5.7

28.0 ± 4.7

27.7 ± 6.2

0.338

Age(years)

66.5 ± 8.1

64.7 ± 8.3

67.4 ± 7.9

< 0.001

ASA status, n (%)

   

0.009

 I

155 (6.7)

68 (8.6)

87 (5.7)

 

 II

2016 (87.3)

668 (84.5)

1348 (88.8)

 

 III

138 (6.0)

55 (7)

83 (5.5)

 

Details of operation

    

LOS(Days)

4.0 (3.0, 6.0)

4.0 (4.0, 6.0)

4.0 (3.0, 5.0)

< 0.001

Operation duration (mins)

75.0 (65.0, 95.0)

80.0 (65.0, 95.0)

75.0 (65.0, 95.0)

0.228

Day of week of operation, n (%)

   

0.142

 Monday

381 (16.5)

144 (18.2)

237 (15.6)

 

 Tuesday

526 (22.8)

184 (23.3)

342 (22.5)

 

 Wednesday

395 (17.1)

126 (15.9)

269 (17.7)

 

 Thursday

522 (22.6)

161 (20.4)

361 (23.8)

 

 Friday

365 (15.8)

127 (16.1)

238 (15.7)

 

 Saturday

120 (5.2)

49 (6.2)

71 (4.7)

 

Perioperative blood transfusion, n (%)

   

0.021

 No

2200 (95.3)

742 (93.8)

1458 (96)

 

 Yes

109 (4.7)

49 (6.2)

60 (4)

 

Patient comorbidities

    

Preoperative Hb (g/dL)

13.1 ± 1.5

13.1 ± 1.5

13.1 ± 1.4

0.57

Smoking, n (%)

   

0.069

 No

2088 (90.4)

728 (92)

1360 (89.6)

 

 Yes

221 (9.6)

63 (8)

158 (10.4)

 

OSA, n (%)

   

0.672

 No

2098 (90.9)

722 (91.3)

1376 (90.6)

 

 Yes

211 (9.1)

69 (8.7)

142 (9.4)

 

DM, n (%)

   

1.000

 No

1869 (80.9)

640 (80.9)

1229 (81)

 

 Yes

440 (19.1)

151 (19.1)

289 (19)

 

IHD, n (%)

   

0.950

 No

2184 (94.6)

749 (94.7)

1435 (94.5)

 

 Yes

125 (5.4)

42 (5.3)

83 (5.5)

 

CCF, n (%)

   

0.088

 No

2292 (99.3)

789 (99.7)

1503 (99)

 

 Yes

17 (0.7)

2 (0.3)

15 (1)

 

CVA, n (%)

   

1.000

 No

2266 (98.1)

776 (98.1)

1490 (98.2)

 

 Yes

43 (1.9)

15 (1.9)

28 (1.8)

 

Creatinine > 2 mg/dL, n (%)

   

0.719

 No

2041 (88.4)

702 (88.7)

1339 (88.2)

 

 Yes

17 (0.7)

7 (0.9)

10 (0.7)

 

 NA

251 (10.9)

82 (10.4)

169 (11.1)

 
  1. Data presented are mean ± SD, median (Q1–Q3), or n (%)
  2. GA general anesthesia, RA regional anesthesia, BMI body mass index, ASA Status American Society of Anesthesiologist Physical Status, Hb hemoglobin, LOS length of stay, OSA Obstructive sleep apnea, DM diabetes mellitus, IHD ischemic heart disease, CCF congestive cardiac failure, CVA cerebrovascular accidents, SD standard deviation, NA not recorded
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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X