Table 4.

Item-total-correlation as well as retest reliability index on item level

	Item	Item-total correlation	Retest reliability index on item levela
1	Fainting	0.44, p<0.001	0.73, p<0.001
2	Dizziness/transitory blindness	0.72, p<0.001	0.74, p<0.001
3	Transitory deafness, changed acoustic perception	0.62, p<0.001	0.68, p<0.001
4	Changed visual perception	0.64, p<0.001	0.76, p<0.001
5	Numbness	0.67, p<0.001	0.66, p<0.001
6	Transitory paralysis	0.56, p<0.001	0.59, p<0.001
7	Analgesia	0.55, p<0.001	0.76, p<0.001
8	Heavy and tired	0.68, p<0.001	0.66, p<0.001
9	Tension	0.56, p<0.001	0.38, p=0.007
10	Feeling of nausea	0.68, p<0.001	0.67, p<0.001
11	Out of body	0.45, p<0.001	0.82, p<0.001
12	Inability to speak	0.60, p<0.001	0.87, p<0.001
13	Weakness and hot flash	0.62, p<0.001	0.70, p<0.001

Note.

^aThe retest reliability index on item level was calculated in study sample 1.