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Table 3 Item-total correlations for the original and the reduced ABQ

From: Validation of the Adherence Barriers Questionnaire – an instrument for identifying potential risk factors associated with medication-related non-adherence

Item Original 16-item ABQ Reduced 14-item ABQ
(Cronbach’s α: 0.814) (Cronbach’s α: 0.820)
Item-total correlation coefficient Cronbach’s α if item is deleted Item-total correlation coefficient Cronbach’s α if item is deleted
Item 1: “I fully understand what my doctor, nurse or the people at my pharmacy have explained to me so far”. 0.599 0.795 0.634 0.798
Item 2: „I can mention the names of my medicines and their scope without hesitation”. 0.371 0.808 0.397 0.813
Item 3: „I trust my doctor and agree to my therapy plan together with him”. 0.461 0.805 0.443 0.811
Item 4: “My medications help me only if I take them absolutely regularly as recommended”. 0.394 0.808 0.375 0.814
Item 5: „Medicines are all poisonous. You should avoid taking medicines at all if possible”. 0.263 0.815 - -
Item 6: „I feel basically healthy. Therefore I am sometimes unsure whether I really have to take my medicines daily”. 0.225 0.817 - -
Item 7: „I take my medicines every day automatically at a fixed time or on fixed occasions”. 0.351 0.809 0.326 0.816
Item 8: „I feel that co-payments for medicines are a great burden”. 0.400 0.807 0.395 0.814
Item 9: „I frequently forget things on an everyday basis”. 0.416 0.804 0.431 0.81
Item 10: „Generally I often feel bad, and sometimes I feel discouraged and depressed”. 0.534 0.796 0.567 0.799
Item 11: „I frequently have problems taking my medications or it is difficult for me to keep me on the accompanying conditions of the medication intake”. 0.634 0.789 0.640 0.793
Item 12: „I have to overcome obstacles to my healthcare”. 0.505 0.798 0.546 0.801
Item 13: „I really would need help on an everyday basis (and particularly related to my treatment with medicines). But I do not get any help”. 0.600 0.792 0.610 0.796
Item 14: „I am really frightened of the side effects of my medicines”. 0.424 0.804 0.393 0.812
Item 15a: „In case I already noticed or in case I would notice side effects related to my medicines: I have talked or would talk to my doctor about them as soon as possible”. 0.274 0.812 0.265 0.819
Item 15b: „In case I already noticed or in case I would notice side effects related to my medicines: I have stopped/would stop my medications or took/would take less of them”. 0.373 0.808 0.337 0.818
  1. ABQ: Adherence Barriers Questionnaire.