Table 3.

Sum score to IRT score translation table for the 7-item DCI-A-SF

Sum Score	T-Score	Standard Error
0	20.1	5.4
1	22.1	5.1
2	24.3	4.8
3	25.7	4.7
4	27.4	4.5
5	29.1	4.3
6	30.6	4.2
7	32.2	4.1
8	33.6	4.0
9	35.0	3.9
10	36.4	3.9
11	37.7	3.9
12	39.0	3.8
13	40.3	3.8
14	41.6	3.8
15	42.9	3.8
16	44.2	3.9
17	45.5	3.9
18	46.9	3.9
19	48.3	4.0
20	49.8	4.0
21	51.3	4.1
22	53.0	4.2
23	54.8	4.3
24	56.8	4.5
25	58.9	4.7
26	61.4	5.0
27	64.1	5.3
28	68.0	6.0