Table 2.
Primary outcomes at baseline and follow-up and difference over time between groups
|
Median (interquartile range) or proportion (%)
|
|||
|---|---|---|---|
| Measurement | Minimal intervention strategy | Usual care | Mean difference*or odds ratio†(95% CI) |
|
Functional disability (RDQ, 0-24)
|
|
|
|
| Baseline
|
13 (7-16) (n=143)
|
13 (8-16) (n=171)
|
Mean difference 0.25 (−0.77 to 1.28) |
| 6 weeks
|
4 (1-9) (n=142)
|
4 (1-10) (n=163)
|
|
| 13 weeks
|
2 (0-6) (n=140)
|
2 (0-5) (n=163)
|
|
| 26 weeks
|
1 (0-4) (n=134)
|
1 (0-3) (n=163)
|
|
| 52 weeks | 1 (0-4) (n=132) | 1 (0-4) (n=154) | |
| No recovery‡ | |||
| Baseline
|
-
|
-
|
Odds ratio 1.16 (0.63 to 2.17) |
| 6 weeks
|
56/142 (39)
|
60/163 (38)
|
|
| 13 weeks
|
47/141 (33)
|
53/164 (32)
|
|
| 26 weeks
|
44/136 (32)
|
50/163 (31)
|
|
| 52 weeks | 42/132 (32) | 43/156 (28) | |
|
Sick leave because of low back pain§
|
|
|
|
| Baseline
|
40/115 (35)
|
57/139 (41)
|
Odds ratio 0.69 (0.43 to 1.13) |
| 6 weeks
|
19/116 (16)
|
26/132 (20)
|
|
| 13 weeks
|
5/114 (4)
|
17/134 (13)
|
|
| 26 weeks
|
3/110 (3)
|
11/134 (8)
|
|
| 52 weeks | 8/107 (8) | 9/128 (7) | |
RDQ=Roland-Morris disability questionnaire (higher scores mean more functional disability).
Minimum intervention strategy (MIS) minus usual care (UC), adjusted for baseline values and estimated with multilevel analysis. Mean difference >0 means that over 12 months MIS group had higher mean score on functional disability than UC group.
MIS versus UC, estimated with multilevel analysis. For sick leave, adjusted for baseline values. An odds ratio >1 means that over 12 months more patients in MIS group than in the UC group reported sick leave or no recovery.
Yes=slightly improved + no change + slightly worse + much worse + very much worse.
Proportion of patients on sick leave because of low back pain among working population.