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Validity of the Asthma Control Test completed at home
Michael Schatz1, David M Mosen, Mark Kosinski
1Department of Allergy, Kaiser Permanente, San Diego, Calif, USA. michael.x.schatz@kp.org
The American Journal of Managed Care
|December 12, 2007
Summary
The Asthma Control Test (ACT) is a valid tool for assessing asthma control in adults, showing strong correlations with other measures and confirming optimal cutoffs for well-controlled and poorly controlled asthma.
Area of Science:
- Pulmonary Medicine
- Clinical Assessment Tools
- Asthma Research
Background:
- The Asthma Control Test (ACT) is widely used to assess asthma control.
- Additional validity data is needed using diverse settings and populations.
Purpose of the Study:
- To provide further validity evidence for the ACT.
- To evaluate ACT performance using a different criterion measure, setting, and patient population.
Main Methods:
- A cross-sectional survey was conducted.
- 570 adult patients with asthma completed questionnaires at home, including the ACT, ATAQ, Mini-AQLQ, and symptom scales.
Main Results:
- ACT scores showed significant correlations with the ATAQ (r=-0.73), Mini-AQLQ (r=0.77), and symptom frequency scale (r=-0.69).
- Optimal ACT cutoffs were confirmed: ≥20 for well-controlled asthma and ≤15 for poorly controlled asthma.
Conclusions:
- The study supports the validity of the ACT in a home setting.
- These findings reinforce the ACT's utility for assessing asthma control in a general patient population.
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