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

From: Questionnaire for the assessment of adherence barriers of intravitreal therapy: the 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
  1. "−"item excluded as exclusion led to an increase of Cronbach's alpha, " + " item kept