Table 6 Relation between demographic data, disease duration, time of procedure, and target level baseline data of the studied cases and outcome

Age (years)

< 40, N (%)

38 (44.2%)

8 (22.9%)

χ²

≥ 40, N (%)

48 (55.8%)

27 (77.1%)

4.80

0.03*

2.67 (1.09–6.55)

BMI (kg/m²)

Normal, N (%)

7 (8.1%)

1 (2.9%)

χ²

1

Overweight, N (%)

36 (41.9%)

16 (45.7%)

0.15

0.56 NS

3.11 (0.35–7.70)

Obese, N (%)

43 (50%)

18 (51.4%)

2.93 (0.34–5.57)

Sex

Female, N (%)

51 (59.3%)

19 (54.3%)

χ²

Male, N (%)

35 (40.7%)

16 (45.7%)

0.26

0.61 NS

1.23 (0.56–2.71)

Procedure

US, N (%)

42 (48.8%)

17 (48.6%)

χ²

FL, N (%)

44 (51.2%)

18 (51.4%)

0.01

0.98 NS

1.01 (0.46–2.22)

Duration (months)

< 6

56 (65.1%)

13 (37.1%)

χ²

≥ 6

30 (34.9%)

22 (62.9%)

7.94

0.005**

3.16 (1.40–7.15)

Time of procedure: (min.)

Mean ± SD

8.81 ± 2.85

9.03 ± 3

t

Range

5–13.5

5–13.5

0.39

0.70 NS

–

Target level

L2–3/L3–4, N (%)

2 (2.3%)

7 (20%)

χ²

10.63

L 4–5, N (%)

23 (26.7%)

8 (22.9%)

(2.09–24.14)

L4–5/L5–S1, N (%)

38 (44.2%)

13(37.1%)

11.34

0.01*

L5–S1, N (%)

23 (26.7%)

7(20%)

Type of lumbar disc

Central, N (%)

57 (66.3%)

18 (51.4%)

Diffuse, N (%)

26 (30.2%)

9 (25.7%)

11.33

0.003**

8.20

Foramen, N (%)

3 (3.5%)

8 (22.9%)

(2.03–23.11)

Schober Test before (cm)

Mean ± SD

3.5 ± 1.43

3.09 ± 1.23

t

Range

1.8–7

1.5–6.5

1.49

0.14 NS

–

Straight leg raising (^°)

Mean ± SD

50.03 ± 15.92

46.07 ± 10.02

t

Range

30–75

30–70

1.36

0.18 NS

–

VAS (mm)

Mean ± SD

70.70 ± 6.11

71.8 ± 6.93

t

Range

59–82

59–82

0.87

0.39 NS

–

Oswestry Disability Index (%)

Mean ± SD

55.27 ± 6.75

56.11 ± 7.64

t

Range

40.70–69.2

42.7–68.5

0.61

0.55 NS

–

Sacral hiatus diameter

(n = 42)

(n = 17)

MW

Mean ± SD

4.68 ± 1.52

4.71 ± 2.09

0.42

0.68 NS

–

Range

1.8–8.9

1.3–8