|
Preoperative baseline variables
|
|
Age at surgery, mean (SD)
|
56.9 (13.4)
|
60.8 (14.2)
|
56.4 (13.2)
|
0.950
|
|
BMI, mean (SD)
|
24.1 (3.1)
|
24.2 (3.8)
|
24.1 (3.0)
|
0.731
|
|
Male
|
237 (43)
|
30 (43.5)
|
207 (42.7)
|
0.076
|
|
Diabetes
|
60 (10.8)
|
9 (13.0)
|
51 (10.5)
|
0.965
|
|
Smoker
|
144 (26.0)
|
22 (31.9)
|
120 (25.2)
|
0.573
|
|
Chronic steroid use
|
11 (1.99)
|
5 (7.25)
|
6 (1.24)
|
< 0.001
|
|
Albumin level < 3.5 g/dl
|
13 (2.35)
|
6 (8.70)
|
7 (1.44)
|
0.001
|
|
Diagnose
|
|
Herniation
|
270 (48.7)
|
33 (47.8)
|
237 (48.9)
|
-
|
|
Stenosis
|
86 (15.5)
|
12 (17.4)
|
74 (15.3)
|
0.053
|
|
Spondylolisthesis
|
198 (35.7)
|
24 (34.8)
|
174 (35.8)
|
0.397
|
|
Operative variables
|
|
Operative time, mean (SD), min
|
160.8 (43.9)
|
154.4 (48.5)
|
161.8 (43.2)
|
0.593
|
|
Bleeding volume, mean (SD) mL
|
318.5 (90.8)
|
284.1 (30.4)
|
311.4 (89.6)
|
0.662
|
|
Postoperative variables
|
|
Albumin level < 3.5 g/dl
|
314 (56.7)
|
56 (81.2)
|
258 (53.2)
|
0.023
|
|
Albumin level < 3.0 g/dl
|
110 (19.9)
|
36 (52.2)
|
74 (15.3)
|
0.001
|
|
Postoperative drainage median, ml, (IQR)
|
223.5 (151.0–309.0)
|
205.0 (120.0–300.0)
|
231.0 (154.5–310.5)
|
0.003
|
|
Length of stay, day, median (SD)
|
11.0 (9.0–14.0)
|
17.0 (13.0–22.5)
|
11.0 (9.0–13.0)
|
< 0.001
|
|
Hospitalization expenses mean, thousand CNY (SD)
|
25.6 (8.7)
|
35.0 (17.5)
|
24.2 (5.5)
|
< 0.001
|
