Questionnaire for the assessment of adherence barriers of intravitreal therapy: the ABQ-IVT

Table 2 Reliability analysis of items included in the preliminary 24-item ABQ-IVT

		DME	nAMD	“Overlap"
	n	78	156	234
	Cronbach's α coefficient	0.81	0.79	0.78
Item	Abbreviation
1	‘Information’	+	+	+
2	‘Education’	–	–	–
3	‘Trust in physician’	+	+	+
4	‘Shared decision making’	+	–	+
5	‘Need for compliance to appointments’	–	–	–
6	‘Discomfort in doctor's office’	+	+	+
7	‘Belief in need of therapy’	+	–	+
8	‘Positive treatment experience at start of therapy’	–	–	–
9	‘Hope for healing’	–	–	–
10	‘Unsatisfaction’	+	–	+
11	‘Immediate medical consultation in case of deterioration’	–	–	–
12	‘Depression’	+	+	+
13	‘Forgetfulness’	–	–	–
14	‘Cost of treatment’	–	+	+
15	‘Side effects’	+	+	+
16	‘Discussion of concerns with physician’	–	–	–
17	‘Time commitment’	+	+	+
18	‘Travel/opportunity costs’	+	+	+
19	‘Challenge accompanying person’	+	+	+
20	‘Burden for family members’	+	+	+
21	‘Lack of support’	+	+	+
22	‘Comorbidity’	+	+	+
23	‘Private/professional obligations’	+	+	+
24	‘Too old for therapy to be worthwhile’	+	+	+
	Number of items	16	14	17

"−"item excluded as exclusion led to an increase of Cronbach's alpha, " + " item kept

ISSN: 2056-9920