Item-level psychometrics of a brief self-reported memory problem screening measure in breast cancer survivors

Figures & data

Table 1. Distribution of item responses.

Item	Category 1	Category 2	Category 3	Category 4	Category 5
1	0.782	0.129	0.057	0.032	–
2	0.529	0.234	0.131	0.073	0.032
3	0.535	0.218	0.145	0.077	0.024
4	0.428	0.267	0.206	0.071	0.028
5	0.248	0.289	0.222	0.145	0.095

Table 2. Parameter estimates and SEs for fitting the item factor analytic model.

Item	λ	t1	t2	t3	t4
1	0.600 (0.046)	0.778 (0.063)	1.348 (0.079)	1.848 (0.110)	–
2	0.918 (0.013)	0.073 (0.056)	0.718 (0.062)	1.253 (0.076)	1.848 (0.110)
3	0.986 (0.009)	0.089 (0.056)	0.686 (0.061)	1.276 (0.077)	1.973 (0.121)
4	0.894 (0.014)	−0.181 (0.057)	0.510 (0.059)	1.287 (0.077)	1.907 (0.115)
5	0.806 (0.020)	−0.679 (0.061)	0.094 (0.056)	0.705 (0.062)	1.311 (0.078)

Table 3. Item parameter estimates for the normal-ogive graded response model.

Item	${\alpha }_j$	d1	d2	d3	d4
1	0.750	1.297	2.247	3.080
2	2.315	0.080	0.782	1.365	2.013
3	5.913	0.090	0.696	1.294	2.001
4	1.995	−0.202	0.570	1.430	2.133
5	1.362	−0.842	0.117	0.875	1.627

Figure 1. Item category characteristic curves (blue) and item information functions (pink) for the five items of the self-reported memory problems (SRMP) measure.