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Developing a questionnaire to measure patients' beliefs about inhaler treatment for asthma: Tests of validity and
Christopher Hand1, Sylvia Morley1, Malcolm Adams1
1School of Health Policy and Practice, University of East Anglia, Norwich NR4 7TJ, UK.
Aim:
To develop a valid and reliable questionnaire for measuring patients' beliefs about inhaler treatments for asthma.
Methods:
In seven general practices, 335 patients prescribed both beclomethasone and salbutamol inhalers completed a 66-item questionnaire. Sub-scales were developed using factor analysis and a 29-item questionnaire sent to 90 patients in another practice to estimate test-retest reliability.
Results:
Three factors explained 31.4% of the variance relating to beliefs about inhalers: preventing asthma symptoms, problems with and concerns about inhalers, and relieving asthma symptoms. Cronbach's alpha coefficients of the sub-scales were 0.71, 0.70 and 0.70 respectively. Intra-class correlation coefficients were 0.87 or more for all three sub-scales. The prevention and relief scale scores were significantly correlated with estimates of corticosteroid and β2-agonist use.
Conclusions:
A valid and reliable questionnaire has been developed for measuring patients' beliefs about inhaler treatments for asthma. Its utility in predicting adherence and facilitating patient education needs to be tested.
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