Table 3.

The internal consistency of the Swedish VVAS.

	CI-TC	α if item deleted
Item 1	0.715	0.813
Item 2	0.461	0.840
Item 3	0.771	0.799
Item 4	0.520	0.830
Item 5	0.657	0.816
Item 6	0.636	0.817
Item 7	0.334	0.847
Item 8	0.485	0.835
Item 9	0.492	0.834

CI-TC Corrected Item-Total Correlation; α: Cronbach’s alpha.

Corrected Item-Total Correlation (CI-TC) was calculated for each item. A value of <0.3 can be regarded as grounds for removal from a questionnaire, as it indicates that the item may not be associated with the other statements. In addition, the Cronbach’s alpha was recalculated for the removal of each item. The Cronbach’s alpha for the intact questionnaire was 0.843.