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Environmental control includes measures to prevent exposure to common aeroallergens in an individual’s home. Questionnaires are part of the clinical practice of health assessment, and are also widely used in research. Our aim was to develop and validate a questionnaire to identify possible sources of aeroallergens present in the indoor environment. This study describes the development, validation and application of a questionnaire. For content validation the Content Validation Index and Ordinal Cronbach’s Alpha Index have been used; Polychoric Correlations for the agreement between judges; and an Exploratory Factor Analysis for the structure of the questionnaire, while for reliability assessment, Intraclass Correlation Coefficient has been applied. Twenty-one doctors participated as judges to validate the questionnaire, which 204 patients answered. The Content Validity Index for all the questions on the “Clarity” aspect was 0.846 ± 0.152 and on the “Relevance” aspect, 0.954 ± 0.080. Cronbach’s alpha coefficient for the “Clarity” aspect was 0.88 with a 95% confidence intervals (CI) and the “Relevance” aspect, 0.94 with a 95% CI. The average Intraclass Correlation Coefficient was 0.94 and all the F tests were highly significant. The questionnaire developed by our group was considered valid and reliable, and is capable of portraying the home environment without the need for a personal visit to the patient’s home. This questionnaire would be a good tool to use in research or during patient consultations to assess the patient’s home environment, as this latter assessment is essential for the management of patients with respiratory allergies.

Development, validation and application of a questionnaire to qualify the indoor environmental exposure of patients with respiratory allergy