Reliability
The Cronbach’s alpha coefficient for the final AAMQ-13 was found to be
0.87 suggesting that the questionnaire has a very high internal
consistency, it also has good split half reliability (Spearman-Brown
coefficient= 0.743). Item 4 ‘I stop taking my medication out of
fear of potential side effects ’ had the highest item-total correlation
(Table IV). The highest Item-Item correlations (0.755) was observed
between item 11 ‘I stop taking my inhaler because I did not
understand my doctor/pharmacist instructions on how to use it ’ and item
12 ‘I do not take my inhaler as I find it difficult to use it ’.