Development and calibration of a novel social relationship item bank to measure health-related quality of life (HRQoL) in Singapore

Kwan, Yu Heng; Uy, Elenore Judy; Bautista, Dianne Carrol; Xin, Xiaohui; Xiao, Yunshan; Lee, Geok Ling; Subramaniam, Mythily; Vaingankar, Janhavi Ajit; Chan, Mei Fen; Kumar, Nisha; Cheung, Yin Bun; Chua, Terrance Siang Jin; Thumboo, Julian

doi:10.1186/s12955-019-1150-9

Table 4 IRT Calibration Results of SR item bank

From: Development and calibration of a novel social relationship item bank to measure health-related quality of life (HRQoL) in Singapore

Item ID	Mean	Item-theta correlation	Cronbach’s alpha if deleted	IRT					GRM item fit p-value
Item ID	Mean	Item-theta correlation	Cronbach’s alpha if deleted	Discrimination	B1	B2	B3	B4	GRM item fit p-value
SQ01	4.584	0.711	0.961	2.072	−2.43	−2.18	−1.75	0.55	1.000
SQ32	4.35	0.713	0.961	1.509	−2.74	− 2.25	− 1.39	−0.09	0.734
SQ39	4.531	0.673	0.962	1.378	−3.54	−3.18	− 2.06	− 0.30	0.193
SQ11	4.546	0.754	0.961	2.081	−2.58	− 2.29	−1.71	− 0.42	1.000
SQ02	4.175	0.672	0.962	1.179	−2.63	−1.97	− 1.13	0.06	0.711
SQ33	4.286	0.71	0.961	1.266	−2.94	− 2.40	−1.33	0.07	0.714
SQ10	4.493	0.629	0.962	1.191	−2.76	− 2.29	−1.81	− 0.46	0.086
SQ40	4.483	0.713	0.961	1.418	−4.16	−3.00	−1.74	−0.23	0.997
SQ12	4.553	0.702	0.961	1.608	−2.77	−2.30	−1.65	−0.53	0.981
SQ07	4.171	0.641	0.962	1.021	−2.89	− 2.09	−1.17	0.12	0.446
SQ16	4.125	0.627	0.962	0.963	−3.5	−2.36	−1.08	0.29	0.226
SQ34	3.917	0.607	0.962	0.95	−2.33	−1.68	−0.79	0.29	0.000
SQ41	4.235	0.692	0.961	1.23	−3.16	−2.24	−1.13	0.04	0.030
SQ04	4.545	0.692	0.961	1.54	−2.64	− 2.28	−1.65	−0.53	0.888
SQ08	4.453	0.711	0.961	1.435	−2.78	−2.29	−1.55	−0.30	0.997
SQ17	4.376	0.66	0.962	1.153	−3.77	−2.88	−1.50	−0.11	0.613
SQ43	4.326	0.607	0.962	1.007	−3.95	−2.74	−1.47	−0.08	0.229
SQ45	4.517	0.72	0.961	1.634	−2.83	−2.41	−1.63	−0.38	0.828
SQ31	4.266	0.675	0.961	1.229	−2.73	−2.32	−1.32	0.02	0.630
SQ35	4.26	0.642	0.961	1.044	−3.42	−2.57	−1.29	0.06	0.402
SQ44	4.292	0.734	0.961	1.464	−3.24	−1.97	− 1.22	−0.04	0.060
SQ05	4.503	0.674	0.961	1.445	−2.5	−2.36	−1.58	−0.48	0.546
SQ18	3.817	0.6	0.962	0.863	−2.96	−1.75	−0.62	0.64	0.073
SQ15	4.024	0.586	0.962	0.896	−3.01	−2.56	−1.04	0.54	0.191
SQ37	4.475	0.66	0.962	1.221	−4.35	−3.36	−1.89	−0.18	0.949
SQ06	4.345	0.673	0.961	1.256	−2.56	−2.19	−1.41	−0.18	0.999
SQ20	3.787	0.575	0.962	0.794	−3.48	−1.97	−0.51	0.80	0.005
SQ48	4.167	0.663	0.962	1.138	−2.75	−2.11	−1.14	0.13	0.078
SQ50	2.765	0.074	0.969	0.157	−3.95	−0.11	2.26	5.29	0.000
SQ51	3.974	0.656	0.962	1.05	−2.73	−2.20	−1.01	0.73	0.321

Abbreviations: Social relationships (SR), item response theory (IRT), graded response model (GRM)

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