Table 6 Mean Oswestry disability score (with standard deviations) at baseline and 24 months by different subgroups
|
Subgroup
|
Surgery
|
Rehabilitation
|
Centre
|
|
|
A:
|
|
|
Baseline
|
42.2 (14.9)
|
40.3 (12.1)
|
24 months
|
24.6 (20.7)
|
28.9 (17.3)
|
B:
|
|
|
Baseline
|
46.7 (13.1)
|
46.9 (15.1)
|
24 months
|
31.4 (18.5)
|
43.7 (20.9)
|
C:
|
|
|
Baseline
|
48.7 (14.0)
|
47.8 (15.8)
|
24 months
|
42.0 (18.8)
|
43.3 (19.7)
|
D:
|
|
|
Baseline
|
49.3 (14.8)
|
45.8 (15.8)
|
24 months
|
39.7 (20.9)
|
33.6 (22.1)
|
Clinical classification
|
|
|
Spondylolisthesis:
|
|
|
Baseline
|
42.1 (15.1)
|
38.0 (13.8)
|
24 months
|
35.7 (25.4)
|
30.1 (19.9)
|
Post-laminectomy:
|
|
|
Baseline
|
50.7 (14.2)
|
47.3 (10.2)
|
24 months
|
38.0 (18.4)
|
33.7 (14.8)
|
Chronic back pain:
|
|
|
Baseline
|
46.7 (14.5)
|
45.4 (15.2)
|
24 months
|
33.3 (20.8)
|
37.2 (21.1)
|
Litigation
|
|
|
No:
|
|
|
Baseline
|
45.6 (14.9)
|
44.2 (15.1)
|
24 months
|
34.0 (21.7)
|
35.4 (20.9)
|
Yes:
|
|
|
Baseline
|
52.0 (11.3)
|
49.1 (12.4)
|
24 months
|
34.1 (17.7)
|
41.5 (17.0)
|
Smoking
|
|
|
No:
|
|
|
Baseline
|
45.5 (14.6)
|
43.1 (14.9)
|
24 months
|
29.5 (19.1)
|
34.6 (19.3)
|
Yes:
|
|
|
Baseline
|
47.8 (14.5)
|
46.9 (14.6)
|
24 months
|
40.6 (22.2)
|
38.4 (22.2)
|
Planned type of surgery
|
|
|
Graf:
|
|
|
Baseline
|
45.2 (12.6)
|
42.5 (17.2)
|
24 months
|
35.1 (18.9)
|
35.6 (24.3)
|
Fusion:
|
|
|
Baseline
|
46.8 (14.9)
|
45.3 (14.4)
|
24 months
|
33.9 (21.5)
|
36.4 (19.8)
|
|