Randomised controlled trial of physiotherapy compared with advice for low back pain
BMJ 2004; 329 doi: https://doi.org/10.1136/bmj.38216.868808.7C (Published 23 September 2004) Cite this as: BMJ 2004;329:708
Data supplement
Table 1. [As supplied by authors] Mean (SD) change in health scores from baseline for the two study groups at 2, 6 and 12 months for subjects with valid data at each individual assessmentTherapy group
(N=144)
Advice only group
(N=142)
Mean difference
(95% CI)
P-value:
t-test
(ANCOVAa)
Mean (SD)
Change
N Effect
size
Mean (SD) change
N Effect
size
Oswestry Disability Index (%)
2 months
-3.09 (10.02)
121 0.28
-1.67 (10.40)
113 0.14
-1.42 (-4.05 to 1.21)
.29 (.19)
6 months
-3.27 (11.93)
108 0.30
-3.42 (10.80)
96 0.30
0.15 (-3.01 to 3.31)
.93 (.82)
12 months
-3.75 (11.50)
101 0.35
-3.70 (11.05)
97 0.34
-0.05 (-3.22 to 3.11)
.97 (.91)
Roland and Morris
2 months
-1.31 (4.26)
124 0.31
-0.71 (3.80)
112 0.16
-0.59 (-1.63 to 0.45)
.26 (.25)
6 months
-1.18 (4.75)
110 0.28
-1.28 (4.58)
95 0.29
0.10 (-1.19 to 1.39)
.88 (.69)
12 months
-1.23 (4.70)
106 0.30
-1.56 (4.23)
97 0.36
0.33 (-0.91 to 1.57)
.60 (.90)
SF-36 Physical component
2 months
0.43 ( 9.26)
116 0.04
-1.38 ( 9.33)
108 0.12
1.81 (-0.64 to 4.26)
.15 (.19)
6 months
0.01 ( 9.84)
105 0.00
-0.46( 8.92)
91 0.04
0.48 (-2.19 to 3.14)
.73 (.98)
12 months
0.59 (10.33)
90 0.06
-1.15( 10.21)
87 0.11
1.74 (-1.31 to 4.78)
.26 (.37)
SF-36 Mental component
2 months
0.86 ( 8.24)
116 0.09
-1.40 (8.78)
108 0.13
2.26 ( 0.02 to 4.50)
.048 (.038)
6 months
0.13 ( 8.35)
105 0.01
-0.35 (7.88)
91 0.03
0.48 (-1.82 to 2.78)
.68 (.57)
12 months
0.46 ( 9.14)
90 0.04
-1.22 (8.88)
87 0.12
1.68 (-0.99 to 4.36)
.22 (.14)
a effect of group adjusting for baseline score, age, gender, smoking status, and time since first episode of back pain
Table 2 [As supplied by authors] Patient perceived benefits of treatment at 2, 6 and 12 months post randomisation for subjects with valid data at each individual assessment
Patient perceived benefit
Therapy group (n=144)
Advice only group
(n=142)
RR of perceived benefit (95% CI)
P-value: X2 (logistic regressiona)
2 months
Perceived benefit
93 (76.9%)
64 (59.8%)
1.29 (1.07 to 1.54)
.009 (.002)
No perceived benefit
28 (23.1%)
43 (40.2%)
6 months
Perceived benefit
70 (64.8%)
45 (51.7%)
1.25 (0.98 to 1.60)
.089 (.014)
No perceived benefit
38 (35.2%)
42 (48.3%)
Patient perceived benefit? (0-10 scale)
Mean difference (95% CI)
P-value:
t-test (ANCOVAa)
2 months
5.42 (2.84)
n=119
3.66 (2.78)
n=103
1.76 (1.01 to 2.51)
.001 (<.001)
6 months
4.74 (3.24)
n=107
3.81 (3.00)
n=85
0.93 (0.03 to 1.83)
.043 ( .013)
12 months
5.15 (3.06)
n=100
4.28 (2.92)
n=94
0.87 (0.02 to 1.72)
.044 ( .041)
a effect of group adjusting for age, gender, smoking status, and time since first episode of back pain.
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