Psychometric properties and predictive validity of the PP-ACT

Area of Science:

• Pediatric Pulmonology
• Health Outcomes Research
• Psychometrics

Background:

• The Parent Proxy Asthma Control Test (PP-ACT) is a caregiver-reported measure for assessing asthma control in children.
• Understanding the psychometric properties of the PP-ACT is crucial for its accurate application in research and clinical settings.

Purpose of the Study:

• To examine the psychometric properties, reliability, and predictive validity of the Parent Proxy Asthma Control Test (PP-ACT).
• To determine if the PP-ACT assesses distinct constructs related to childhood asthma control.

Main Methods:

• Two studies were conducted with a total of 1622 caregivers of children with asthma.
• Caregivers completed the PP-ACT along with other measures assessing child health outcomes, including emergency department visits and quality of life.

Main Results:

• The PP-ACT was found to assess two distinct constructs: PP-ACT4 (items 1-4) measuring symptoms, impairment, and short-acting beta-2 blocker use, and Item 5 measuring caregivers' global assessment of asthma control.
• Both PP-ACT4 and Item 5 uniquely predicted emergency department visits, symptom-free days, and child quality of life.
• PP-ACT4 uniquely predicted inhaled corticosteroid (ICS) use, while Item 5 uniquely predicted exacerbation frequency.

Conclusions:

• The PP-ACT4 and Item 5 should be treated as distinct indicators of asthma control due to their differential prediction of asthma outcomes.
• Recognizing these distinct constructs can enhance the interpretation of PP-ACT results in clinical practice and research.