Developing a shortened spine functional index (SFI-10) for patients with sub-acute/chronic spinal disorders: a cross-sectional study

Table 5 Rasch analysis of the SFI-10 (n = 505 and n = 1433 are similar)

Item	SFI-25 Item #	Outfit		Infit		Item Difficulties
Item	SFI-25 Item #	n = 505	n = 1433	n = 505	n = 1433	n = 505	n = 1433
1. Avoid Heavy Jobs	3.	1038	1167	0,967	1051	−0,675	− 0,535
2. Pain / Problem	6.	1001	1038	0,991	1022	−0,833	−0,570
3. Duties / Chores	10.	0,648	0,699	0,715	0,771	−0,071	0,093
4. Sleep	11.	1236	1277	1171	1174	−0,463	−0,416
5. Personal Care	12.	1231	0,992	1105	1005	1414	0,841
6. Daily Activity	13.	0,785	0,805	0,812	0,822	−0,229	−0,056
7. Dressing	16.	1040	0,971	0,993	0,963	0,606	0,247
8. Sitting	20.	0,969	0,996	0,952	0,948	−0,308	−0,239
9. Stand	22.	0,985	0,938	1005	0,951	0,015	−0,058
10. Reach/Bend Down	24.	0,848	0,890	0,877	0,918	−0,196	− 0,024

ISSN: 1471-2474