Journal
JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY
Volume 133, Issue 1, Pages 91-+Publisher
MOSBY-ELSEVIER
DOI: 10.1016/j.jaci.2013.06.029
Keywords
Asthma; asthma control; Asthma Control Questionnaire; validity; minimally important difference
Categories
Funding
- National Institutes of Health/National Heart, Lung, and Blood Institute [U01 HL080433, U01 HL080450]
- American Lung Association
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Background: The Asthma Control Questionnaire (ACQ) is a patient-centered tool for evaluating asthma control. It has been validated in adults, but not well-validated among children. Objective: We evaluated the reliability, validity, and responsiveness to change of the ACQ for assessing asthma control in children ages 6 to 17 years. A threshold value for poor disease control and a minimally important difference were also determined. Methods: Data from 305 asthmatic children enrolled in a clinical trial were examined. The ACQ was administered at 8 visits. We analyzed results for the combined age group and for the 6- to 11-year-old and 12- to 17-year-old age groups separately. Results: Overall, the Cronbach alpha value (internal consistency) for the ACQ was 0.74 at baseline, and the intraclass correlation coefficient (test-retest reliability) for repeated questionnaires among stable patients was 0.53. The Pearson correlations between the ACQ and other asthma questionnaires were moderate to strong (-0.64 to -0.73). Mean ACQ scores were higher (worse) in patients whose peak flow decreased, who used more rescue medications, or who sought medical care for asthma than in patients who were stable (P < .0001 for all measures). Changes in ACQ scores were significantly different among patients with deteriorating, improving, or stable asthma symptoms (P <= .01). The optimal threshold indicating poor asthma control was 1.25 or greater. The minimally important difference was established to be 0.40. Results for the separate age groups were similar. Conclusion: The ACQ is a moderately reliable, valid, and responsive tool with adequate psychometric properties for assessing recent asthma control among children.
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