Item Response Theory Analysis of Two Questionnaire Measures of Arthritis-Related Self-Efficacy Beliefs from Community-Based US Samples

Table 4

Item parameters for 9-item Rheumatoid arthritis self-efficacy scale (RASE) subset.

Item	a	b1	b2	b3	b4
3	1.59	−1.81	−0.97	1.35
8	1.40	−2.99	−1.55	−0.64	1.91
10	0.70	−4.22	−2.05	−0.69	4.11
13	2.24	−2.47	−1.45	1.01
14	2.23	−1.79	−1.03	1.18
15	1.13	−3.57	−1.94	−0.93	2.14
19	1.94	−1.79	−1.06	1.39
20	2.10	−1.98	−1.42	1.03
26	1.42	−2.51	0.56