Short-form development of the specific module of the QLICD-CRF(V2.0) for assessing the quality of life of patients with chronic renal failure

Table 2 Scaling information of the SPD-10 items based on the classical test theory (CTT) and item response theory analyses

Item	CTT				Generalized Partial Credit Model						Number of criteria satisfied
Item	①	②	③	④	①	②	③	④	⑤	⑥	Number of criteria satisfied
CRF1	0.563**	0.781	0.435	0.566	0.704	-2.061	-0.731	-2.360	-0.049	0.425	6
CRF2	0.639**	0.773	0.511	0.639	0.789	-1.743	-0.280	-1.199	1.858	0.489	6
CRF3	0.674**	0.770	0.531	0.644	0.707	-0.921	-0.177	-0.862	0.615	0.480	6
CRF4	0.571**	0.777	0.476	0.583	0.661	-1.055	-1.790	-1.351	0.850	0.399	6
CRF5	0.582**	0.777	0.477	0.569	0.572	-0.488	-1.669	-1.461	0.168	0.353	6
CRF6	0.620**	0.768	0.558	0.645	0.987	-1.681	-0.915	-1.594	0.190	0.682	7
CRF7	0.338**	0.808	0.192	0.238	0.194	-2.969	-2.959	-0.955	3.232	0.050	1
CRF8	0.609**	0.774	0.500	0.579	0.686	-1.755	-1.207	-0.831	1.453	0.402	6
CRF9	0.675**	0.767	0.549	0.661	0.849	-0.831	-0.921	-0.414	1.227	0.581	7
CRF10	0.585**	0.779	0.456	0.523	0.522	-1.094	-1.381	-0.912	0.268	0.304	6

CTT: ① Item-total correlation, ② Cronbach alpha, ③ Corrected item-total correlation, ④ Factor loading; GPCM: ① α, ②~⑤ β₁~β₄, ⑥ Average information. **P<0.01

ISSN: 1471-2288