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Table 1 Proportion of sample answering yes to each question and the Spearman correlation matrix for all six questionnaire items

From: Validation of the inhaler adherence questionnaire

Please think about your use of your [name of inhaled corticosteroid]
In the last 3 months …
Proportion YES Q1 Q2 Q3 Q4 Q5 Q6
Q1. … have you at times been careless about using your inhaler? 47.3 1.00 0.62* 0.48* 0.12 0.60* 0.26
Q2. … have you ever forgotten to use your inhaler? 59.5 0.62* 1.00 0.28*** 0.10 0.40** 0.21
Q3. … have you ever stopped using your inhaler because you felt better? 28.4 0.48* 0.28*** 1.00 0.19 0.64* 0.06
Q4. … have you ever stopped using your inhaler because you felt worse? 1.4 0.12 0.10 0.19 1.00 0.14 0.23**
Q5. … have you ever used your inhaler less than the doctor prescribed because you felt better? 40.5 0.60* 0.40** 0.64* 0.14 1.00 0.06
Q6. … have you ever used your inhaler more than the doctor prescribed because you felt you were having an attack? 20.3 0.26 0.21 0.06 0.23** 0.06 1.00
  1. *p < 0.0001
  2. **p < 0.005
  3. ***p < 0.05