Differential Item Functioning Related to Age in the Reading Subtest of the Test of Functional Health Literacy in Adults

Table 2

Item difficulties, discriminations, and betas.

Item	Difficulty	SD	Discrimination	Beta
A1^a	0.880	0.326	0.398	0.087
A2	0.918	0.275	0.520	0.047
A3	0.809	0.394	0.504	0.116
A4	0.924	0.267	0.510	0.049
A5	0.940	0.238	0.499	0.032
A6	0.967	0.179	0.163	0.012
A7	0.874	0.332	0.549	0.025
A8	0.880	0.326	0.444	0.058
A9	0.858	0.350	0.386	0.085
A10	0.880	0.326	0.562	0.026
A11	0.902	0.299	0.472	0.063
A12	0.951	0.217	0.444	0.060
A13	0.902	0.299	0.417	0.052
A14	0.863	0.344	0.395	0.062
A15	0.842	0.366	0.391	0.073
B16	0.934	0.248	0.396	0.054
B17	0.924	0.267	0.473	0.044
B18	0.951	0.217	0.431	0.058
B19	0.645	0.480	0.393	0.094
B20	0.902	0.299	0.390	0.057
B21	0.721	0.450	0.504	0.115
B22	0.836	0.371	0.427	0.044
B23	0.934	0.248	0.369	0.036
B24	0.634	0.483	0.361	0.170
B25	0.809	0.394	0.464	0.071
B26	0.809	0.394	0.451	0.099
B27	0.863	0.344	0.601	0.082
B28	0.913	0.283	0.470	0.051
B29	0.820	0.386	0.543	0.034
B30	0.754	0.432	0.660	0.109
B31	0.798	0.403	0.520	0.072
B32	0.814	0.390	0.520	0.118
B33	0.869	0.339	0.526	0.054
B34	0.426	0.496	0.394	0.151
B35	0.874	0.332	0.666	0.062
B36	0.863	0.344	0.641	0.052
C37	0.863	0.344	0.570	0.079
C38	0.743	0.438	0.707	0.031
C39	0.579	0.495	0.512	0.091
C40	0.579	0.495	0.522	0.146
C41	0.448	0.499	0.529	0.050
C42	0.710	0.455	0.627	0.051
C43	0.628	0.485	0.633	0.100
C44	0.678	0.469	0.630	0.074
C45	0.251	0.435	0.346	0.183
C46	0.481	0.501	0.621	0.110
C47	0.197	0.399	0.244	0.074
C48	0.519	0.501	0.535	0.048
C49	0.568	0.497	0.564	0.090
C50	0.628	0.485	0.694	0.070

aLetter prefixes before items numbers denote from which of the three test paragraphs the item is drawn.