Table 4.
Predictive validity of postural stability
| Pain | Roland Morris Questionnaire | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Non-normalised data | p | Normalised data | p | Non-normalised data | p | Normalised data | p | |||||
| No or negative change | Clinical relevant change | No or negative change | Clinical relevant change | No or negative change | Clinical relevant change | No or negative change | Clinical relevant change | |||||
| n | 37 | 42 | 37 | 42 | 35 | 36 | 35 | 36 | ||||
| mVel EC, mm/sec at first visit, mean (CV) | 16.2 (39%) | 15.1 (30%) | 0.36 | 15.7 (28%) | 15.5 (24%) | 0.88 | 15.0 (32%) | 15.2 (37%) | 0.88 | 15.4 (24%) | 15.5 (27%) | 0.84 |
| APdispl EC, mm at first visit, mean (CV) | 51.6 (41%) | 54.6 (28%) | 0.47 | 52.8 (35%) | 55.1 (25%) | 0.56 | 58.6 (30%) | 54.1 (34%) | 0.29 | 58.0 (23%) | 53.6 (32%) | 0.24 |
| RRvel at first visit, mean (SD) | 1.41 (0.25) | 1.32 (0.19) | 0.08 | 1.40 (0.21) | 1.32 (0.20) | 0.11 | 1.41 (0.19) | 1.32 (0.21) | 0.09 | 1.41 (0.19) | 1.32 (0.21) | 0.07 |
Patients are grouped in two according to pain and back-specific function: patients with minimal important change compared to patients with no or negative change during follow-up period. Difference in postural stability in the two groups are presented. Changes are presented as back transformed