Table 1.
Results for content validation of the low back pain survey questionnaire by content experts
| Item number | Question description | Expert raters | I-CVIa | |||
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | |||
| Q1 | Lifetime prevalence | 4 | 4 | 4 | 4 | 1.00 |
| Q2 | Age of onset | 4 | 4 | 4 | 4 | 1.00 |
| Q3 | Recurrent NSLBPc | 4 | 4 | 4 | 2 | 0.75 |
| Q4 | Frequency of recurrent NSLBP | 4 | 4 | 4 | 3 | 1.00 |
| Q5 | Duration of recurrent NSLBP | 2 | 4 | 4 | 4 | 0.75 |
| Q6 | Intensity of recurrent NSLBP | 4 | 4 | 4 | 4 | 1.00 |
| Q7 | Sciatica | 4 | 4 | 4 | 4 | 1.00 |
| Q8 | Point prevalence | 4 | 4 | 4 | 4 | 1.00 |
| Q9 | Point pain intensity | 4 | 4 | 4 | 4 | 1.00 |
| Q10 | Medical treatment | 4 | 4 | 4 | 4 | 1.00 |
| Q11a | Sitting on a chair | 4 | 4 | 4 | 4 | 1.00 |
| b) | Reaching up | 4 | 4 | 4 | 4 | 1.00 |
| c) | Standing | 4 | 4 | 4 | 4 | 1.00 |
| d) | Walking | 4 | 4 | 4 | 4 | 1.00 |
| e) | Sporting activity | 4 | 4 | 4 | 4 | 1.00 |
| f) | Bending | 4 | 4 | 4 | 4 | 1.00 |
| g) | School-bag carrying | 4 | 4 | 4 | 4 | 1.00 |
| h) | Sitting up in bed | 4 | 4 | 4 | 4 | 1.00 |
| i) | Running | 4 | 4 | 4 | 4 | 1.00 |
| Q12 | Absenteeism | 3 | 4 | 4 | 4 | 1.00 |
| Q13 | Bag carriage | 4 | 4 | 4 | 4 | 1.00 |
| Q14 | Perception school-bag weight | 4 | 4 | 4 | 3 | 1.00 |
| Q15 | Duration of carrying school-bag | 3 | 4 | 4 | 4 | 1.00 |
| Q16 | Method of carrying school-bag | 4 | 4 | 4 | 4 | 1.00 |
| Q17 | Sports participation | 4 | 4 | 4 | 4 | 1.00 |
| Q18 | Type of sport | 4 | 4 | 4 | 4 | 1.00 |
| Q19 | Sports duration | 4 | 4 | 4 | 4 | 1.00 |
| Q20 | Sedentary time | 3 | 4 | 4 | 4 | 1.00 |
| Q21 | Smoking | 4 | 4 | 4 | 1 | 0.75 |
| Q22 | Past week smoking | 4 | 4 | 4 | 1 | 0.75 |
| dTotal agreement=0.86 bS-CVI/Ave = 0.97 | ||||||
aI-CVI (Item content validity index) =computed as the number of content valid experts giving a rating of either 3 (quite relevant) or 4 (highly relevant), divided by the total number of experts.
bS-CVI/Ave (scale content validity index) =computed as the average I-CVIs for all the items in the questionnaire.
cNSLBP= non-specific low back pain
dTotal agreement= the number of items that achieved the I-CVI of 1.00 divided by the total number of items to be validated in the questionnaire