Psychometric evaluation of the Swedish self-rated 36-item version of WHODAS 2.0 for use in psychiatric populations – using classical test theory

Figures & data

Figure 1. Description of study sample, the recruitment process and diagnostic characteristics of the final sample and the test–retest sample, n (%).

Table 1. Ratings on the 36-item WHODAS 2.0 in Swedish psychiatric outpatients (N = 780), range 0–4.

Item	Mean	SD	Correlated Item-Total Correlation	Cronbach’s alpha if item deleted
Domain 1 – Cognition, Cronbach item deleted
D11	1.28	1.06	0.70	0.84
D12	1.46	1.07	0.66	0.84
D13	1.34	1.08	0.71	0.84
D14	1.06	1.06	0.64	0.85
D15	0.87	0.95	0.65	0.85
D16	1.07	1.08	0.62	0.85
Domain 2 – Mobility, Cronbachh item delete
D21	1.00	1.12	0.66	0.82
D22	0.63	0.90	0.69	0.82
D23	0.44	0.79	0.72	0.82
D24	0.93	1.12	0.62	0.82
D25	0.78	1.12	0.69	0.81
Domain 3 Cronbachh item deletedn in Swedis
D31	0.46	0.86	0.52	0.63
D32	0.36	0.74	0.58	0.62
D33	0.87	1.13	0.50	0.64
D34	0.97	1.28	0.46	0.68
Domain 4 Cronbachh item deletedn in Swedish ps
D41	1.14	1.15	0.63	0.77
D42	1.16	1.14	0.72	0.75
D43	0.98	0.99	0.54	0.80
D44	1.52	1.36	0.71	0.75
D45	1.40	1.43	0.48	0.83
Domain 5 – Life activities (n = 648), Cronbach (hh item del
D51	1.29	1.18	0.77	0.94
D52	1.18	1.14	0.74	0.94
D53	1.54	1.25	0.80	0.93
D54	1.60	1.30	0.77	0.93
D55	1.66	1.33	0.79	0.93
D56	1.44	1.30	0.78	0.93
D57	1.56	1.37	0.83	0.93
D58	1.55	1.40	0.83	0.93
Domain 6 onbach (hh item deletedn in Swedish ps
D61	1.48	1.28	0.67	0.86
D62	1.01	1.08	0.59	0.87
D63	1.02	1.14	0.63	0.87
D64	1.80	1.10	0.53	0.88
D65	2.25	1.18	0.72	0.87
D66	1.41	1.35	0.64	0.86
D67	1.44	1.18	0.70	0.86
D68	1.53	1.31	0.67	0.86

High scores indicate high disability.

Figure 2. Confirmatory Factor analysis, using 32-items of the original WHODAS 2.0 scale, leaving out items D5.5 through D5.8, Domains 1–6 corresponds to: cognition, mobility, self-care, getting along, life activities, and participation.

Figure 3. Scatter plot and regression line of correlations between the total sum of the 36-item version of WHODAS 2.0 and the Sheehan Disability Scale (SDS), (n = 395).

Figure 4. Results on the 36-item self-administered version of the WHODAS 2.0 (range 0–144) in psychiatric outpatients presented for different groups based on their main diagnosis (n = 755). Patients without a known diagnosis are not presented in the table (n = 25, 3.2%).