Translation, cultural adaptation, and psychometric testing of the Supportive care needs survey for partners and caregivers for Swedish family members of persons diagnosed with colorectal cancer

Journal of Patient-Reported Outcomes

Table 3 Psychometric evaluation of the SCNS-P&C45-S domains

Domains	Items	Mean	SD	Scale Mean if Item Deleted	Item-scale correlations							Cronbach’s Alpha if Item Deleted
					Own scale	Other Scales (Difference)
						PEN		WSN		IN
Domain 1 Health Care Service Needs (HCN)	Item 7	1.86	1.287	16.39	0.84	0.51	(0.33)^†	0.68	(0.16)^†	0.74	(0.10)^†	0.95
	Item 8	1.64	1.183	16.61	0.69	0.31	(0.38)^†	0.57	(0.12)^†	0.44	(0.25)^†	0.95
	Item 9	1.61	1.061	16.64	0.81	0.67	(0.15)^†	0.81	(0)^††	0.71	(− 0.10)^††	0.95
	Item 10	1.64	1.059	16.61	0.79	0.68	(0.11)^†	0.83	(− 0.14)^††	0.81	(− 0.02)^††	0.95
	Item 11	1.77	1.198	16.48	0.88	0.62	(0.26)^†	0.76	(0.12)^†	0.81	(0.07)^†	0.94
	Item 12	1.73	1.188	16.52	0.91	0.55	(0.36)^†	0.78	(0.13)^†	0.72	(0.19)^†	0.94
	Item 13	1.55	1.044	16.70	0.89	0.56	(0.33)^†	0.81	(0.07)^†	0.64	(0.25)^†	0.94
	Item 14	1.84	1.055	16.41	0.71	0.56	(0.15)^†	0.65	(0.06)^†	0.67	(0.04)^†	0.95
	Item 16	1.48	1.023	16.77	0.79	0.41	(0.38)^†	0.73	(0.73)^†	0.58	(0.21)^†	0.95
	Item 17	1.75	1.014	16.50	0.81	0.56	(0.25)^†	0.68	(0.13)^†	0.69	(0.12)^†	0.95
	Item 20	1.39	0.868	16.86	0.44	0.61	(− 0.25)^††	0.47	(− 0.03)^††	0.37	(0.07)^†	0.96
	Cronbach’s alpha 0.95 Internal homogeneity 0.64				Probable Scaling Success 73%				Probable Scaling Failure 27%

	Items	Mean	SD	Scale Mean if Item Deleted	Item-scale correlations							Cronbach’s Alpha if Item Deleted
					Own scale	Other scales (Difference)
						WSN		IN		HCN
Domain 2 Psychological and Emotional Needs (PEN)	Item 31	2.00	1.121	19.20	0.73	0.72	(0.08)^†	0.81	(− 0.77)^††	0.72	(0.01)^†	0.91
	Item 32	1.41	0.693	19.80	0.64	0.46	(0.18)^†	0.49	(0.15)^†	0.51	(0.13)^†	0.91
	Item 33	1.75	1.081	19.45	0.58	0.58	(0)^††	0.73	(− 0.15)^††	0.69	(− 0.11)^††	0.91
	Item 34	1.50	0.849	19.70	0.70	0.56	(0.14)^†	0.43	(0.27)^†	0.43	(0.27)^†	0.91
	Item 35	1.23	0.565	19.98	0.69	0.50	(0.19)^†	0.55	(0.14)^†	0.44	(0.44)^†	0.91
	Item 36	1.23	0.605	19.98	0.54	0.17	(0.37)^†	0.20	(0.34)^a	0.12	(0.42)^a	0.91
	Item 37	1.57	0.900	19.64	0.70	0.62	(0.08)^†	0.51	(0.19)^†	0.54	(0.16)^†	0.91
	Item 38	1.41	0.816	19.80	0.45	0.65	(0.20)^†	0.43	(0.02)^†	0.49	(− 0.04)^††	0.92
	Item 39	1.59	0.948	19.61	0.69	0.53	(0.16)^†	0.51	(0.18)^†	0.39	(0.30)^†	0.91
	Item 40	1.41	0.726	19.80	0.75	0.63	(0.12)^†	0.53	(0.22)^†	0.52	(0.23)^†	0.91
	Item 41	1.95	1.099	19.25	0.69	0.65	(0.04)^†	0.79	(− 0.10)^††	0.65	(0.04)^†	0.91
	Item 42	1.48	0.876	19.73	0.69	0.61	(0.08)^†	0.55	(0.14)^†	0.51	(0.18)^†	0.91
	Item 43	1.20	0.668	20.00	0.52	0.29	(0.23)^a	0.13	(0.39)^a	0.12	(0.40)^a	0.91
	Item 44	1.48	0.849	19.73	0.59	0.41	(0.18)^†	0.26	(0.33)^†	0.22	(0.37)^†	0.91
	Cronbach’s alpha 0.92 Internal homogeneity 0.45				Probable Scaling Success 79%				Probable Scaling Failure† 21%

	Items	Mean	SD	Scale Mean if Item Deleted	Item-scale correlations				Cronbach’s Alpha if Item Deleted
					Own scale	Other scales (Difference)
					Own scale	IN	HCN	PEN
Domain 3 Work and Social Needs (WSN)	Item 21	1.55	0.875	8.55	0.52	0.54 (− 0.02)^††	0.56 (0.04)^††	0.67 (− 0.15)^††	0.77
	Item 22	1.52	0.849	8.57	0.39	0.39 (0)^††	0.34 (0.05)^†	0.61 (− 0.22)^††	0.79
	Item 26	1.48	0.952	8.61	0.71	0.68 (0.03)^†	0.78 (− 0.07)^††	0.47 (0.24)^†	0.73
	Item 27	1.52	1.067	8.57	0.54	0.49 (0.05)^†	0.72 (− 0.18)^††	0.37 (0.20)^†	0.77
	Item 28	1.27	0.660	8.82	0.39	0.47 (− 0.08)^††	0.57 (− 0.18)^††	0.31 (0.08)^†	0.79
	Item 29	1.45	0.730	8.64	0.65	0.53 (0.12)^†	0.50 (0.15)^†	0.66 (0.01)^††	0.75
	Item 30	1.30	0.632	8.80	0.55	0.47 (0.08)^†	0.45 (0.10)^†	0.50 (0.05)^†	0.77
	Cronbach’s alpha 0.80 Internal homogeneity 0.36				Probable Scaling Success 14%		Probable Scaling Failure† 86%

	Items	Mean	SD	Scale Mean if Item Deleted	Item-scale correlations				Cronbach’s Alpha if Item Deleted
					Own scale	Other scales (Difference)
					Own scale	IN	HCN	PEN
Domain 4 Information Needs (IN)	Item 1	1.84	1.119	10.95	0.88	0.76 (0.12)^†	0.57 (0.31)^†	0.71 (0.17)^†	0.91
	Item 2	2.05	1.275	10.75	0.88	0.72 (0.16)^†	0.60 (0.28)^†	0.63 (0.25)^†	0.91
	Item 4	1.82	1.147	10.98	0.76	0.71 (0.05)^†	0.51 (0.25)^†	0.61 (0.15)^†	0.92
	Item 5	1.82	1.084	10.98	0.87	0.73 (0.14)^†	0.56 (0.31)^†	0.64 (0.23)^†	0.91
	Item 6	1.89	1.125	10.91	0.82	0.71 (0.11)^†	0.57 (0.25)^†	0.63 (0.19)^†	0.91
	Item 23	1.61	0.97	11.18	0.43	0.28 (0.15)^†	0.46 (− 0.03)^b	0.26 (0.17)^†	0.95
	Cronbach’s alpha 0.93 Internal homogeneity 0.64				Probable Scaling Success 86%		Probable Scaling Failure†14%

^†Probable Scaling Success = Item-own-scale correlation > item-other-scale correlation p < 0.05
^††Probable Scaling Failure = Item-own-scale correlation ≤ item-other-scale-correlation p < 0.05
^aProbable Scaling Success = Item-own-scale correlation > item-other-scale correlation p > 0.05
^bProbable Scaling Failure = Item-own-scale correlation ≤ item-other-scale-correlation p > 0.05