Evidence for validity of the Swedish self-rated 36-item version of the World Health Organization Disability Assessment Schedule 2.0 (WHODAS 2.0) in patients with mental disorders: a multi-centre cross-sectional study using Rasch analysis

Svanborg, Cecilia; Amer, Ahmed; Nordenskjöld, Axel; Ramklint, Mia; Söderberg, Per; Tungström, Stefan; Ginsberg, Ylva; Hermansson, Liselotte

doi:10.1186/s41687-022-00449-8

Journal of Patient-Reported Outcomes

Table 4 Rating scale category structure for all items of the Swedish WHODAS 2.0

From: Evidence for validity of the Swedish self-rated 36-item version of the World Health Organization Disability Assessment Schedule 2.0 (WHODAS 2.0) in patients with mental disorders: a multi-centre cross-sectional study using Rasch analysis

	Value (logits) at thresholds between categories^¤					Distance (logits) between adjacent thresholds*
Domain	Threshold 1 (Cat. 0–1)	Threshold 2 (Cat. 1–2)	Threshold 3 (Cat. 2–3)	Threshold 4 (Cat. 3–4)	Increase monotonically	Thresholds 1–2	Thresholds 2–3	Thresholds 3–4
D1.1	− 2.16	− 0.37	0.94	1.59	Yes	− 1.79	− 1.31	− 0.65
D1.2	− 2.60	− 0.14	0.78	1.96	Yes	− 2.46	− 0.92	− 1.18
D1.3	− 2.31	− 0.27	0.83	1.74	Yes	− 2.04	− 1.10	− 0.91
D1.4	− 1.63	− 0.39	0.71	1.32	Yes	− 1.24	− 1.10	− 0.61
D1.5	− 2.56	− 0.08	0.85	1.78	Yes	− 0.48	− 0.93	− 0.93
D1.6	− 1.72	− 0.15	0.67	1.21	Yes	− 1.57	− 0.82	− 0.54
D2.1	− 1.34	0.20	0.59	0.55	No	− 1.54	− 0.39	0.04
D2.2	− 2.17	0.04	1.06	1.06	No	− 2.21	− 1.02	0.00
D2.3	− 2.20	0.26	1.01	0.92	No	− 2.46	− 0.75	0.09
D2.4	− 1.50	0.11	0.72	0.66	No	− 1.61	− 0.61	0.06
D2.5	− 0.66	− 0.04	0.51	0.18	No	− 0.62	− 0.55	0.33
D3.1	− 2.01	0.38	1.25	0.38	No	− 2.39	− 0.87	0.87
D3.2	− 0.50	0.55	− 0.05	*N.A*	No	− 1.05	0.60	*N.A*
D3.3	− 1.33	− 0.03	0.99	0.37	No	− 1.30	− 0.02	0.62
D3.4	− 0.66	0.27	0.42	− 0.03	No	− 0.93	− 0.15	0.45
D4.1	− 1.80	0.19	0.51	1.09	Yes	− 1.99	− 0.32	− 0.58
D4.2	− 1.64	− 0.03	0.59	1.09	Yes	− 1.61	− 0.62	− 0.50
D4.3	− 1.96	− 0.34	0.77	1.53	Yes	− 1.62	− 1.11	− 0.76
D4.4	− 0.97	− 0.08	0.48	0.57	Yes	− 0.89	− 0.56	− 0.09
D4.5	− 0.37	− 0.17	0.19	0.34	Yes	− 0.20	− 0.36	− 0.15
D5.1	− 1.74	− 0.01	0.67	1.07	Yes	− 1.73	− 0.68	− 0.40
D5.2	− 1.40	− 0.31	0.79	0.91	Yes	− 1.09	− 1.10	− 0.12
D5.3	− 1.62	0.04	0.56	1.02	Yes	− 1.66	− 0.52	− 0.46
D5.4	− 1.37	0.05	0.31	1.01	Yes	− 1.42	− 0.26	− 0.70
D5.5	− 0.82	− 0.43	0.20	1.06	Yes	− 0.39	− 0.63	− 0.86
D5.6	− 0.73	− 0.43	0.19	0.97	Yes	− 0.30	− 0.62	− 0.78
D5.7	− 0.77	− 0.31	0.45	0.63	Yes	− 0.46	− 0.76	− 0.18
D5.8	− 0.71	− 0.16	0.27	0.60	Yes	− 0.55	− 0.43	− 0.33
D6.1	− 1.39	0.09	0.32	0.98	Yes	− 1.48	− 0.23	− 0.66
D6.2	− 1.39	− 0.30	0.58	1.10	Yes	− 1.09	− 0.88	− 0.52
D6.3	− 1.66	0.23	0.48	0.96	Yes	− 1.89	− 0.25	− 0.48
D6.4	− 2.49	− 0.23	0.55	2.16	Yes	− 2.26	− 0.78	− 1.61
D6.5	− 2.26	0.10	0.52	1.64	Yes	− 2.36	− 0.42	− 1.12
D6.6	− 1.26	0.36	0.31	0.59	No	− 1.62	0.05	− 0.28
D6.7	− 2.23	0.26	0.55	1.42	Yes	− 2.49	− 0.29	− 0.87
D6.8	− 1.27	0.01	0.31	0.95	Yes	− 1.28	− 0.30	− 0.64

NOTE: Rating scale categories are reversed: low scores indicate greater difficulty. Categories were as follows: 0 = extreme/cannot, 1 = severe, 2 = moderate, 3 = mild, 4 = no difficulty
Domains: D1, Understanding and communicating; D2, Getting around; D3, Self-care; D4, Getting along with people; D5, Life activities; and D6, Participation in society. D5 is divided into two sub-domains: D5a = Domestic responsibilities and D5b = Work and school
^¤Values should increase monotonically; disordered thresholds are in bold
^*The criterion for the distance between adjacent thresholds is 1.4–5.0 logits; distances not meeting the criterion are in bold
N.A. = not applicable because there were no responses in the category extreme/cannot do

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