Table 4 Mean (SD) outcome values at 24 months, and differences in changes from baseline to 24 months
|
|
Surgery (n=176)
|
Rehabilitation (n=173)
|
Difference in change 0-24 months (95% Cl)*
|
P value
|
Oswestry disability index
|
(n=138)
|
(n=146)
|
|
|
24 months
|
34.0 (21.1)
|
36.1 (20.6)
|
-4.1 (-8.1 to -0.1)
|
0.045
|
Shuttle walking test
|
(n=118)
|
(n=126)
|
|
|
24 months
|
352 (244)
|
310 (202)
|
34 (-8 to 77)
|
0.12
|
SF-36 physical component score
|
(n=115)
|
(n=131)
|
|
|
24 months
|
28.8 (14.9)
|
27.6 (14.6)
|
2.0 (-1.2 to 5.3)
|
0.21
|
SF-36 mental component score
|
|
|
|
|
24 months
|
47.4 (12.2)
|
48.1 (12.6)
|
-0.2 (-2.9 to 2.6)
|
0.90
|
Domains of SF-36
|
|
|
|
|
General health perception:
|
|
|
|
|
Baseline
|
47.6 (20.5)
|
46.5 (22.0)
|
|
|
24 months
|
57.7 (23.6)
|
53.8 (24.5)
|
3.2 (-1.9 to 8.2)
|
0.22
|
Physical functioning:
|
|
|
|
|
Baseline
|
33.6 (19.0)
|
39.5 (22.1)
|
|
|
24 months
|
50.0 (28.2)
|
49.8 (28.7)
|
4.8 (-1.2 to 10.8)
|
0.11
|
Role limitation (physical):
|
|
|
|
|
Baseline
|
15.0 (27.1)
|
17.6 (30.5)
|
|
|
24 months
|
39.6 (42.1)
|
38.6 (42.7)
|
2.4 (-7.5 to 12.3)
|
0.63
|
Role limitation (emotional):
|
|
|
|
|
Baseline
|
43.2 (41.4)
|
51.2 (44.0)
|
|
|
24 months
|
65.2 (42.7)
|
65.4 (43.4)
|
2.9 (-7.1 to 13.0)
|
0.57
|
Pain:
|
|
|
|
|
Baseline
|
28.6 (17.3)
|
30.0 (16.0)
|
|
|
24 months
|
48.1 (26.4)
|
44.9 (25.1)
|
4.1 (-1.67 to 10.0)
|
0.16
|
Social functioning:
|
|
|
|
|
Baseline
|
41.1 (23.3)
|
42.8 (22.9)
|
|
|
24 months
|
53.6 (26.2)
|
55.6 (26.2)
|
-0.9 (-6.5 to 4.7)
|
0.76
|
Mental health:
|
60.1 (19.9)
|
60.3 (21.6)
|
|
|
Baseline
|
|
|
|
|
24 months
|
66.5 (21.5)
|
68.4 (23.1)
|
-1.8 (-6.4 to 2.8)
|
0.45
|
Energy and vitality:
|
35.4 (20.0)
|
37.4 (21.7)
|
|
|
Baseline
|
|
|
|
|
24 months
|
46.7 (22.8)
|
46.4 (24.9)
|
1.5 (-3.8 to 6.7)
|
0.58
|
|
* Adjusted for baseline measures. Rehabilitation group is the reference group.
Analysis of covariance adjusted for baseline measure.