Understanding barriers to optimal medication management for those requiring long-term dialysis: rationale and design for an observational study, and a quantitative description of study variables and data

Aspden, Trudi; Wolley, Martin J; Ma, Tian M; Rajah, Edwin; Curd, Samantha; Kumar, Dharni; Lee, Sophia; Pireva, Krenare; Taule’alo, Olita; Tiavale, Porsche; Kam, Angela L; Suh, Jun S; Kennedy, Julia; Marshall, Mark R

doi:10.1186/s12882-015-0097-2

Table 2 Internal consistency of construct item subscales

From: Understanding barriers to optimal medication management for those requiring long-term dialysis: rationale and design for an observational study, and a quantitative description of study variables and data

Construct	Instrument item	Subscale mean if item deleted	Subscale variance if item deleted	Corrected item-total correlation	Squared multiple correlation	Cronbach’s α if item deleted
Medical Adherence Cronbach’s α = 0.77	C1	5.08	3.43	0.57	0.40	0.72
	C2	4.79	3.58	0.49	0.27	0.74
	C3	4.66	3.90	0.39	0.28	0.75
	C4	4.79	3.66	0.44	0.25	0.75
	C5	4.53	4.17	0.40	0.19	0.76
	C6	4.63	3.71	0.56	0.41	0.73
	C7	4.76	3.76	0.40	0.21	0.75
	C8	4.91	3.50	0.51	0.39	0.73
Health Literacy Cronbach’s α = 0.78	F1	5.45	7.62	0.62	0.39	0.70
	F2	4.84	7.69	0.60	0.36	0.72
	F3	5.45	8.23	0.64	0.41	0.69
Medication Knowledge (Original) Cronbach’s α = 0.44	B1	4.45	0.90	0.27	0.39	0.37
	B2	4.14	0.91	0.26	0.18	0.38
	B3	3.83	1.15	0.51	0.62	0.34
	B4	3.86	1.12	0.36	0.51	0.36
	B5	4.69	1.08	0.33	0.24	0.35
	B6	3.90	1.03	0.42	0.35	0.31
	B7	3.90	1.60	−0.39	0.24	0.63
Medication Knowledge – (Modified, B7 omitted) Cronbach’s α = 0.63	B1	3.55	0.97	0.41	0.28	0.57
	B2	3.24	1.05	0.32	0.16	0.62
	B3	2.93	1.35	0.48	0.62	0.58
	B4	2.97	1.32	0.35	0.51	0.59
	B5	3.79	1.24	0.37	0.24	0.58
	B6	3.00	1.21	0.42	0.35	0.57
Beliefs about Medication - Medical Necessity Cronbach’s α = 0.71	D1	16.93	5.96	0.42	0.23	0.73
	D3	17.20	4.12	0.61	0.40	0.66
	D4	16.87	5.39	0.47	0.33	0.71
	D7	17.06	5.27	0.58	0.38	0.67
	D10	16.94	6.06	0.51	0.31	0.70
Beliefs about Medication - Medical Concerns Cronbach’s α = 0.78	D2	11.27	13.57	0.54	0.33	0.74
	D5	10.67	12.47	0.61	0.40	0.72
	D6	11.05	13.89	0.49	0.27	0.76
	D8	11.46	14.09	0.54	0.30	0.74
	D9	10.91	13.92	0.60	0.36	0.73
Illness Perception – Cognitive (Original) Cronbach’s α = 0.41	E1	18.9	37.4	0.31	0.16	0.28
	E2	17.0	46.6	0.10	0.04	0.44
	E3^a	22.2	32.4	0.38	0.16	0.20
	E4^a	24.9	52.7	0.03	0.04	0.45
	E5	20.2	37.0	0.22	0.11	0.36
Illness Perception – Cognitive (Modified, E2 omitted) Cronbach’s α = 0.44	E1	10.1	29.5	0.30	0.15	0.32
	E3^a	13.4	24.9	0.37	0.15	0.22
	E4^a	16.1	43.5	0.02	0.04	0.52
	E5	11.4	26.5	0.29	0.09	0.33
Illness Perception – Cognitive (Modified, E4 omitted) Cronbach’s α = 0.45	E1	18.1	32.9	0.37	0.14	0.28
	E2	16.1	43.5	0.09	0.04	0.52
	E3^a	21.3	30.4	0.35	0.13	0.28
	E5	19.3	33.5	0.23	0.11	0.41
Illness Perception – Cognitive (Modified, E2 and E4 omitted) Cronbach’s α = 0.52	E1	9.2	25.4	0.35	0.13	0.38
	E3^a	12.5	23.2	0.34	0.12	0.41
	E5	10.5	23.3	0.31	0.09	0.46
Illness Perception – Emotional Cronbach’s α = 0.52	E6	5.90	10.1	0.35	0.12	n/a
Illness Perception – Emotional Cronbach’s α = 0.52	E8	6.90	12.0	0.35	0.12	n/a

^aScale reversed for these items (Personal communication E. Broadbent 15 Jan 2015

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