| Male, no. (%) | 6 (25%) | 30 (42%) | 202 (42%) |
| Age, mean ± SD, years | 38.6±5.8 | 36.8±6.6 | 37.3±6.5 |
| Duration of low back pain, mean ± SD, years | 9.3±9.9 | 9.6±7.4 | 9.2±7.7 |
| RMDQ, mean ± SD | 11.1±6.8 | 7.0±5.3 | 8.0±6.1 |
| BASDAI, mean ± SD | 4.9±2.1 | 3.9±2.1 | 4.2±2.3 |
| ASDAS, mean ± SD | 2.8±0.9 | 2.2±0.8 | 2.3±0.9 |
| Working, no. (%) | 15 (62.5) | 55 (77.5) | 342 (72.2) |
| Number of hours work per week, mean ± SD | 24.4±14.6 | 29.3±16.2 | 29.2±15.5 |
| Absenteeism, % ± SD (in working population) | 7.7±19.7 | 4.9±19.0 | 6.4±20.4 |
| Presenteeism, % ± SD (in working population) | 31.3±38.5 | 21.8±31.9 | 26.5±30.7 |
| Work impairment, % ± SD (in working population) | 35.6±41.1 | 25.0±33.8 | 30.1±33.1 |
| Activity impairment, % ± SD | 44.6±37.9 | 31.1±32.5 | 34.4±32.4 |