Warwick Edinburgh Mental Well-Being Scale (WEMWBS): measurement invariance across genders and item response theory examination

Table 3 Item discrimination, difficulty, and loadings of the WEMWBS (N = 386)

Item	Label	a	b₁	b₂	b₃	b₄	Spread	λ loadings
1	WEMWBS_1	2.55	− 1.53	− 0.63	0.47	1.94	3.47	0.83
2	WEMWBS_2	2.29	− 2.01	− 0.68	0.43	2.02	4.03	0.80
3	WEMWBS_3	1.76	− 2.61	− 0.63	0.74	2.77	5.38	0.72
4	WEMWBS_4	1.29	− 2.57	− 0.89	0.39	2.58	5.15	0.60
5	WEMWBS_5	1.69	− 1.45	− 0.13	1.15	2.54	3.99	0.71
6	WEMWBS_6	2.28	− 2.01	− 0.69	0.61	1.98	3.99	0.80
7	WEMWBS_7	2.17	− 2.25	− 1.09	0.17	1.73	3.98	0.79
8	WEMWBS_8	3.83	− 1.44	− 0.45	0.52	1.58	3.02	0.91
9	WEMWBS_9	1.87	− 1.73	− 0.52	0.51	1.97	3.70	0.74
10	WEMWBS10	3.28	− 1.31	− 0.38	0.54	1.60	3.91	0.89
11	WEMWBS11	1.68	− 2.35	− 1.26	0.07	1.61	3.96	0.70
12	WEMWBS12	1.69	− 2.05	− 0.82	0.20	1.41	3.46	0.70
13	WEMWBS13	1.83	− 1.98	− 0.87	0.34	1.72	3.70	0.73
14	WEMWBS14	3.56	− 1.54	− 0.55	0.47	1.81	3.35	0.90

α defines the capacity of an item to discriminate between varying levels of SWB (θ). β defines the level of behaviour intensity, where subsequent response rates are more probable than their previous rate. Spread is the range of difficulty parameters across the different Likert points. λ defines the amount of variance of an item explained by the latent factor

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