Chest
Clinicai Investigations: AsthmaQuestionnaire Items That Predict Asthma and Other Respiratory Conditions in Adults
Section snippets
Subjects
The studies were conducted in the two regions of New South Wales in October (spring) of 1991 and 1992 in Lismore and Wagga Wagga. Subjects, who were the parents of a randomly selected sample of schoolchildren aged 8 to 11 years, were asked to complete a questionnaire and to attend a location in the town center for lung function and allergy tests. The methods have been described in detail4 and are briefly summarized below.
Questionnaire
We used a shortened version of the IUATLD questionnaire.9 The 17 questions
Results
The characteristics of the study samples have been described in detail.4 To summarize, 58% of the sample were female, 91% were in the age range 30 to 50 years, 19% were current smokers, 8% had AHR, and 46% were atopic. Table 1 shows the prevalence of positive responses to the 17 questionnaire items.
When the principal component analysis was carried out separately for the two regions, the factor patterns were similar in each and to those given in Table 2 for the combined sample. The only
Discussion
By using factor analysis, we found that 16 questions identified four separate respiratory conditions, that is asthma, cough, breathlessness, and a subset of asthma that experienced UMV. These identified groups had good validity against the other physical characteristics that were measured. In this study, the regrouping of symptom questions was derived from original data and based on the internal relationship of the questions. Questions were compared by their item correlations to their factor.
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