Development and psychometric evaluation of a new patient -reported outcome measure for psoriasis self-management efficacy: the self-management efficacy questionnaire among patients with psoriasis (SMEQ-PSO)

Table 2 Item analysis

Item	CR	Corrected Item-total correlation coefficients	Cronbach’s α coefficient if item deleted
1	7.147	0.494	0.947
2	7.647	0.502	0.947
3	4.705	0.310^*	0.948
4	7.335	0.542	0.946
5	2.537^*	0.205^*	0.949^*
6	7.703	0.551	0.946
7	9.673	0.589	0.946
8	11.228	0.599	0.946
9	7.293	0.413	0.947
10	12.94	0.591	0.946
11	9.101	0.414	0.947
12	13.537	0.506	0.947
13	11.098	0.57	0.946
14	11.121	0.506	0.947
15	9.512	0.620	0.946
16	9.178	0.579	0.946
17	7.664	0.484	0.947
18	12.850	0.586	0.946
19	5.162	0.265^*	0.948
20	15.593	0.549	0.946
21	12.492	0.610	0.946
22	14.259	0.629	0.946
23	9.622	0.477	0.947
24	8.553	0.491	0.947
25	12.229	0.570	0.946
26	8.500	0.427	0.947
27	13.264	0.578	0.946
28	12.869	0.670	0.946
29	14.714	0.701	0.945
30	12.099	0.645	0.946
31	9.339	0.558	0.946
32	11.685	0.583	0.946
33	11.757	0.536	0.946
34	13.547	0.642	0.946
35	12.974	0.563	0.946
36	14.011	0.594	0.946
37	10.355	0.629	0.946
38	11.819	0.597	0.946
39	10.325	0.492	0.947
40	9.046	0.526	0.946
41	10.074	0.671	0.946
42	10.056	0.671	0.946
43	9.397	0.548	0.946
Criteria	≥ 3	≥ 0.4	≤ 0.948

ISSN: 1477-7525