Table 1.
Patient characteristics and missing data information (n = 628)
| Trial 1 (n = 134) | Trial 2 (n = 195) | Trial 3 (n = 299) | Missing (%) | Value | |
| Age (mean years ± sd) |  |
|
|
0 | 40.6 (9.5) |
| Gender (male, %) | |
|
|
0 | 71.0 |
| Education (%) | |
|
|
26.1 | 73.9 |
| Smoking (%) | |
|
|
7.5 | 43.8 |
| Self-predicted certainty at 6 months (%) | |
|
|
24.4 | 75.6 |
| Physical activity (mean ± sd) | |
|
44.6 | 8.8 (1.0) | |
| Bodyweight (kg) (mean ± sd) | |
|
|
3.3 | 81.1 (15.8) |
| Height (cm) (mean ± sd) | |
|
|
3.3 | 176.6 (9.4) |
| Quality of life (mean ± sd) | |
|
|
2.7 | 0.5 (0.07) |
| Years working in current job (median, IQR) | |
|
24.2 | 35.0 (28) | |
| Full work absence (vs partial) (%) | |
|
|
0.8 | 67.0 |
| Job satisfaction (%) | |
|
2.9 | 97.1 | |
| Job Content Questionnaire: | |||||
| Job control (mean ± sd) | |
|
25.6 | 56.2 (9.2) | |
| Job demands (mean ± sd) | |
|
24.7 | 33.1 (4.8) | |
| Social support (mean ± sd) | |
|
24.8 | 22.5 (4.1) | |
| Daily exposed to: | |||||
| Vibration tools (%) | |
|
27.1 | 5.7 | |
| Lifting >25 kg (%) | |
|
24.2 | 15.3 | |
| Bending and twisting of the trunk (%) | |
|
24.2 | 20.2 | |
| Whole body vibration (%) | |
|
26.4 | 7.8 | |
| Sitting (%) | |
|
24.7 | 14.2 | |
| Working with hands under knee level (%) | |
|
25.0 | 6.6 | |
| Stooping (%) | |
|
25.2 | 19.6 | |
| Duration of complaints (weeks) prior to randomization; (median, IQR) | |
|
|
33.3 | 5.8 (13.3) |
| Pain radiation in 1 or both legs (%) | |
|
|
2.1 | 33.8 |
| Functional status (RDQ) (mean ± sd) | |
|
|
5.1 | 11.3 (5.2) |
| Pain intensity (VAS) in (mean ± sd) | |
|
|
3.0 | 6.2 (1.9) |
| Treatment during enrollment (%) | |
|
|
23.6 | 76.7 |
| Pain intensity at 3 months (VAS) (mean ± sd) | |
|
|
17.8 | 4.5 (2.5) |
| Functional status at 3 months (RDQ) (mean ± sd) | |
|
|
19.9 | 8.8 (6.1) |
| Change in pain intensity* (VAS) (mean ± sd) | |
|
|
20.0 | 2.2 (2.8) |
| Pain coping, active (mean ± sd) | |
|
|
5.6 | 6.7 (1.2) |
| Pain coping, passive (mean ± sd) | |
|
|
7.0 | 6.5 (1.3) |
| Fear avoidance beliefs (FAB) (mean ± sd) | |
|
48.1 | 19.5 (9.7) | |
| Kinesiophobia (Tampa) (mean ± sd) | |
|
|
6.2 | 39.8 (6.7) |
| Body mass index | |
|
|
4.1 | 25.9 (4.0) |
* Average of prognostic indicators representing change in pain.