Table 2.
Test-retest reliability results for the Low Back Pain Questionnaire (N=125)
| Item number | Item description | Percentage agreement (%) | Kappa coefficient (SEk) | 95% CI |
|---|---|---|---|---|
| Q1. | Lifetime prevalence | 96.0 | 0.89 (0.04) | 0.81-0.99 |
| Q3. | Recurrent NSLBP | 87.8 | 0.78 (0.06) | 0.66-0.90 |
| Q4. | Frequency of recurrent NSLBP | 82.9 | 0.71 (0.11) | 0.49-0.93 |
| Q5. | Duration of recurrent NSLBP | 97.0 | 0.65 (0.32) | 0.02-1.00 |
| Q7. | Sciatica | 58.5 | 0.20 (0.12) | 0.00-0.44 |
| Q8. | Point prevalence | 88.7 | 0.38 (0.13) | 0.13-0.63 |
| Q10. | Medical treatment | 95.7 | 0.73 (0.18) | 0.37-1.00 |
| Q11a) | Sitting | 70.2 | 0.38 (0.13) | 0.12-0.64 |
| b) | Reaching up | 78.7 | 0.37 (0.13) | 0.10-0.63 |
| c) | Standing | 61.7 | 0.22 (0.14) | 0.00-0.50 |
| d) | Walking | 68.1 | 0.37 (0.12) | 0.12-0.63 |
| e) | Sporting activity | 68.1 | 0.36 (0.14) | 0.10-0.63 |
| f) | Bending | 72.3 | 0.43 (0.14) | 0.16-0.69 |
| g) | School-bag carrying | 72.3 | 0.39 (0.14) | 0.11-0.67 |
| h) | Sitting | 72.3 | 0.33 (0.16) | 0.03-0.64 |
| i) | Running | 70.2 | 0.17 (0.16) | 0.00-0.50 |
| Q12. | Absenteeism | 91.5 | 0.45 (0.23) | 0.00-0.97 |
| Q13. | Bag Carriage | 99.2 | 0. 94 (0.03) | 0.88-1.00 |
| Q14. | Perception of school bag weight | 91.2 | 0.81 (0.06) | 0.70-0.92 |
| Q15. | Duration of carrying school bag | 75.0 | 0.76 (0.04) | 0.68-0.84 |
| Q16. | Method of carrying school bag | 91.9 | 0.61 (0.11) | 0.40-0.83 |
| Q17. | Sports participation | 98.1 | 0.97 (0.03) | 0.91-1.00 |
| Q19. | Sports duration | 79.2 | 0.69 (0.05) | 0.69-0.88 |
| Q20 | Sedentary time | 73.6 | 0.77 (0.04) | 0.69-0.85 |
| Q21 | Smoking | 96.8 | 0.84 (0.08) | 0.69-0.99 |
| Q22 | Past week smoking | 99.2 | 0.80 (0.20) | 0.40-1.00 |
Q question, SE K standard error of kappa, CI confidence interval, NSLBP non-specific low back pain. Question 2, 6 and 9 are omitted in this analysis