Table 3. Item selection from Rasch analysis.

	CSI-25	1st Round	2nd Round	3rd Round	4th Round Final set
Item removed	-	4, 5, 7, 8, 16, 17, 19, 20, 24, 25	6, 11, 14	3, 21	22
Item remaining	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 18, 19, 20, 21, 22, 23, 24, 25	1, 2, 3, 6, 9, 10, 11, 12, 13, 14, 15, 18, 21, 22, 23	1, 2, 3, 9, 10, 12, 13, 15, 18, 21, 22, 23	1, 2, 9, 10, 12, 13, 15, 18, 22, 23	1, 2, 9, 10, 12, 13, 15, 18, 23
Emotional distress	15, 16, 17, 24	15	15	15	15
Urological and general symptoms	9, 11, 21, 22, 23, 25	9, 11, 21, 22, 23	9, 21, 22, 23	9, 22, 23	9, 23
Muscle problem	2, 18	2, 18	2, 18	2, 18	2, 18
Headache/jaw symptoms	4, 10, 19	10	10	10	10
Sleep disturbance	1, 8, 12	1, 12	1, 12	1, 12	1, 12
Not loading	3, 6, 7, 8, 13, 14, 20	3, 6, 13, 14	3, 13	13	13

Information about the number of items addressing each content in the CSI-25 and CSI-9