Table 1

 Comparison of the answers from the questionnaire and the standardised measurement for each item of postural load

QuestionKappa (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)1381
2.Is the readability poor because of too small letters, bad colours, or too little contrast?*0.12 (−0.18 to 0.43)†1892
3.Do you usually sit right in front of your keyboard?0.21 (−0.16 to 0.59)†4387
4.Do you usually support your forearms during typing?0.28 (0.07 to 0.49)5969
5.Is the angle of your elbow about 90° during typing?0.23 (−0.03 to 0.50)†6473
6.Do you bend your hands backwards during typing?0.07 (−0.15 to 0.29)4859
7.Does the mouse react well on your movements?*0.36 (0.10 to 0.62)†5086
8.Do you usually use your mouse with a stretched arm?0.13 (−0.09 to 0.36)3280
9.Do you often perform series of the same actions without a pause?*0.58 (0.40 to 0.76)7880
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)†5081
11.Do you have problems with the illumination or reflection on your workplace?*0.08 (−0.23 to 0.40)†2782