|
Variable
|
Group I (US) (n = 59)
|
Group II (FL) (n = 62)
|
Test
|
p
|
|
Duration (months)
| | |
MW
| |
|
Mean ± SD
|
5.95 ± 2.5
|
5.82 ± 2.53
| | |
|
Median
|
5
|
5
|
0.60
|
0.55
|
|
Range
|
2–11
|
2–11
| |
NS
|
|
Time of procedure (min)
| | |
t
|
< 0.001**
|
|
Mean ± SD
|
6.10 ± 0.71
|
11.52 ± 1.14
|
31.28
| |
|
Median
|
6
|
11.5
| | |
|
Range
|
5–8
|
10–13.5
| | |
|
Sacral hiatus diameter
|
|
Mean ± SD
|
4.69 ± 1.69
| | | |
|
Median
|
4.9
|
–
|
–
|
–
|
|
Range
|
1.3–8.9
| | | |
|
Variable
|
No
|
%
|
No
|
%
|
χ2
|
p
|
|
Duration (months)
|
|
< 6
|
34
|
57.6
|
35
|
56.5
|
0.02
|
0.90
|
|
≥ 6
|
25
|
42.4
|
27
|
43.5
| |
NS
|
|
Target level
|
|
L2–3/L3–4
|
4
|
6.8
|
5
|
8.1
| | |
|
L4–5
|
15
|
25.4
|
16
|
25.8
| | |
|
L4–5/L5–S1
|
25
|
42.4
|
26
|
41.9
|
0.09
|
0.99
|
|
L5–S1
|
15
|
25.4
|
15
|
24.2
| |
NS
|
|
Type of lumbar disc
|
|
Central
|
37
|
62.7
|
38
|
61.3
| | |
|
Diffuse
|
17
|
28.8
|
18
|
29
|
0.06
|
0.97
|
|
Foraminal
|
5
|
8.5
|
6
|
9.7
| |
NS
|
- SD standard deviation, MW Mann-Whitney test, t independent t test, χ2 chi-squared test, NS non-significant (p > 0.05)
- **Highly significant (p < 0.01)
