Middle East Current Psychiatry

Table 4 Ordinal-to-interval Rasch conversion scores for the Arabic CPQ in logit units and the original ordinal scale metric

From: Examining and enhancing the reliability of the Arabic version of the Clinical Perfectionism Questionnaire

Ordinal scores	Interval scores
Ordinal scores	Logits	Scale
12	− 3.12	12.00
13	− 2.46	15.85
14	− 2.03	18.35
15	− 1.75	19.97
16	− 1.54	21.19
17	− 1.37	22.19
18	− 1.22	23.05
19	− 1.09	23.82
20	− 0.97	24.51
21	− 0.85	25.16
22	− 0.75	25.78
23	− 0.65	26.36
24	− 0.55	26.93
25	− 0.46	27.47
26	− 0.37	28.00
27	− 0.28	28.52
28	− 0.19	29.03
29	− 0.10	29.54
30	− 0.02	30.04
31	0.07	30.53
32	0.16	31.03
33	0.24	31.53
34	0.33	32.04
35	0.42	32.55
36	0.51	33.07
37	0.60	33.61
38	0.69	34.17
39	0.79	34.75
40	0.90	35.37
41	1.02	36.04
42	1.14	36.77
43	1.29	37.60
44	1.45	38.59
45	1.66	39.80
46	1.94	41.43
47	2.38	43.99
48	3.07	48.00

This table should not be used for individuals with one or more missing responses to the scale items

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