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The instruments have been validated in COPD and they have been shown to correlate to other more complex questionnaires.
AQ20 has discriminative properties and responsiveness comparable to more complex questionnaires such as SGRQ [ 24], and 15D and AQ20 have convergent validity to measure HRQoL in COPD [ 25].
The online videos describe how to take an accurate measurement of waist circumference, how to use the two types of dosimeter, and also how to complete one of the more complex questionnaires.
In terms of discriminative properties and responsiveness, the AQ20 was found comparable with more complex questionnaires such as St . Georges Respiratory Questionnaire (SGRQ) [ 12] and Chronic Respiratory Disease Questionnaire (CRQ) [ 24, 33].
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Advantages of web-based surveys compared to paper-based surveys are cost reduction, speed and facilitation of more complex questionnaire routing.
To do this within our study would have resulted in a longer and more complex questionnaire, but such an analysis would be important to pursue in further work.
The CAT has undergone robust validation testing, and has been shown to have very similar properties to the more complex health status questionnaires, the St George's Respiratory Questionnaire (SGRQ) [ 5] and the Chronic Respiratory Questionnaire [ 6].
Summary scores from the instrument show strong validity versus more complex quality of life questionnaires, generic utility measures, disease activity scores and global physician assessment.
The mixed results may also indicate that changes in awareness during a long questionnaire constitute a more complex process, depending on context and the individual items.
The HUNT surveys have also become more complex and demanding for participants with more comprehensive questionnaires, interviews and examinations.
The Shoulder Rating Questionnaire is more detailed, has a more complex calculation of the sum score, and for certain items it misses answers quite often.
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