Table 2.
Frequency of treatment during follow-up according to MRI findings and psychological characteristics at baseline
| No surgery, injection or physical therapy | Surgery | Injection or physical therapy but not surgery | |||||
| n | n | PRa | (95% CI) | n | PRa | (95% CI) | |
| Number of MRI abnormalities | |||||||
| 0 | 20 | 2 | 1 | - | 9 | 1 | - |
| 1 | 16 | 2 | 1.2 | (0.2-7.8) | 9 | 1.3 | (0.6-2.9) |
| 2 | 21 | 11 | 3.4 | (0.8-14.3) | 19 | 1.9 | (1.0-3.6) |
| 3 | 20 | 7 | 3.2 | (0.7-14.3) | 23 | 1.8 | (1.0-3.3) |
| 4 | 14 | 7 | 3.0 | (0.7-13.0) | 11 | 1.6 | (0.8-3.2) |
| Mental Health | |||||||
| Good | 26 | 3 | 1 | - | 25 | 1 | - |
| Intermediate | 29 | 12 | 2.2 | (0.7-7.3) | 15 | 0.6 | (0.4-1.1) |
| Poor | 36 | 14 | 2.7 | (0.8-8.9) | 31 | 0.8 | (0.5-1.3) |
| Number of distressing somatic symptoms | |||||||
| 0 | 48 | 17 | 1 | - | 34 | 1 | - |
| 1 | 20 | 6 | 0.8 | (0.3-1.9) | 17 | 1.1 | (0.7-1.8) |
| ≥ 2 | 23 | 6 | 0.8 | (0.3-1.8) | 20 | 1.2 | (0.8-2.0) |
aPrevalence ratios in comparison with those receiving none of surgery, injection or physical therapy, adjusted for the other baseline characteristics in the table, and also for sex and age (20-39, 40-49 and 50-64 years).
Analysis was restricted to the 191 patients who had not been treated surgically before completing the baseline questionnaire and who provided complete information on relevant risk factors.