Comparison of the answers from the questionnaire and the standardised measurement for each item of postural load
| Question | Kappa (95% CI) | Sensitivity (%) | Specificity (%) | |
|---|---|---|---|---|
| *This question was also asked to the employees. | ||||
| †These kappas must be carefully interpreted, because the answers were not equally distributed among the answer categories. | ||||
| 1. | Do you have to look up, down, or aside to look at your screen during computer work? | −0.06 (−0.28 to 0.15) | 13 | 81 |
| 2. | Is the readability poor because of too small letters, bad colours, or too little contrast?* | 0.12 (−0.18 to 0.43)† | 18 | 92 |
| 3. | Do you usually sit right in front of your keyboard? | 0.21 (−0.16 to 0.59)† | 43 | 87 |
| 4. | Do you usually support your forearms during typing? | 0.28 (0.07 to 0.49) | 59 | 69 |
| 5. | Is the angle of your elbow about 90° during typing? | 0.23 (−0.03 to 0.50)† | 64 | 73 |
| 6. | Do you bend your hands backwards during typing? | 0.07 (−0.15 to 0.29) | 48 | 59 |
| 7. | Does the mouse react well on your movements?* | 0.36 (0.10 to 0.62)† | 50 | 86 |
| 8. | Do you usually use your mouse with a stretched arm? | 0.13 (−0.09 to 0.36) | 32 | 80 |
| 9. | Do you often perform series of the same actions without a pause?* | 0.58 (0.40 to 0.76) | 78 | 80 |
| 10. | Is your chair adjusted in order to put your feet right in front of you with your knees in an angle of 90°? | 0.07 (−0.34 to 0.48)† | 50 | 81 |
| 11. | Do you have problems with the illumination or reflection on your workplace?* | 0.08 (−0.23 to 0.40)† | 27 | 82 |