Use of NON-PARAMETRIC Item Response Theory to develop a shortened version of the Positive and Negative Syndrome Scale (PANSS)

Table 14 Summed-Score Conversion Table for the 19-item and 30-item Negative Symptoms PANSS subscale based on expected total score.

6 Item Negative Mini-PANSS	7 Item Negative Original PANSS	6 Item Negative Mini-PANSS	7 Item Negative Original PANSS
6	7	22	26
7	8	23	27
8	9	24	28
9	10	25	29
10	12	26	30
11	13	27	32
12	14	28	33
13	15	29	34
14	16	30	35
15	18	31	36
16	19	32	37
17	20	33	38
18	21	34	39
19	22	35	40
20	24	36	42
21	25	37	43

Note. The 30-Item Negative subscale ranges from a total score of 7 to 49; the 19-item PANSS for the Negative subscale ranges from a score of 6 to 42. Total scores on the Negative subscale for the 19-item Mini-PANSS are not presented for total scores > 37 based on expected total score ranges of the dataset used.

ISSN: 1471-244X

6 Item Negative Mini-PANSS	7 Item Negative Original PANSS	6 Item Negative Mini-PANSS	7 Item Negative Original PANSS
6	7	22	26
7	8	23	27
8	9	24	28
9	10	25	29
10	12	26	30
11	13	27	32
12	14	28	33
13	15	29	34
14	16	30	35
15	18	31	36
16	19	32	37
17	20	33	38
18	21	34	39
19	22	35	40
20	24	36	42
21	25	37	43

6 Item Negative Mini-PANSS	7 Item Negative Original PANSS	6 Item Negative Mini-PANSS	7 Item Negative Original PANSS
6	7	22	26
7	8	23	27
8	9	24	28
9	10	25	29
10	12	26	30
11	13	27	32
12	14	28	33
13	15	29	34
14	16	30	35
15	18	31	36
16	19	32	37
17	20	33	38
18	21	34	39
19	22	35	40
20	24	36	42
21	25	37	43

6 Item Negative Mini-PANSS	7 Item Negative Original PANSS	6 Item Negative Mini-PANSS	7 Item Negative Original PANSS
6	7	22	26
7	8	23	27
8	9	24	28
9	10	25	29
10	12	26	30
11	13	27	32
12	14	28	33
13	15	29	34
14	16	30	35
15	18	31	36
16	19	32	37
17	20	33	38
18	21	34	39
19	22	35	40
20	24	36	42
21	25	37	43