Table 1.
Patients’ characteristics at study enrolment time
| Description of characteristics | Mean(±SD) or frequency |
|---|---|
| Total number of patients | 80 |
| Age (mean ± SD years) | 58 (±13) |
| Male (%) | 32 (40%) |
| Education, (%) | |
| Primary | 39 (49%) |
| Lower secondary | 27 (34%) |
| Upper secondary | 12 (15%) |
| Graduate | 1 (1%) |
| None | 1 (1%) |
| Number of previous surgical interventions, n (%) | |
| 1 | 23 (33%) |
| 2 | 31 (44%) |
| 3 | 13 (19%) |
| 4 | 3 (4%) |
| Information not available | 10 |
| Age (mean ± SD years) at pain onset | 48 (±14) |
| Time (mean ± SD years) between pain onset and recruitment | 11 (±9) |