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Development of a drug treatment-based severity measure in childhood asthma
Anita L Kozyrskyj1, Cameron A Mustard, F Estelle R Simons
1Department of Community Health Sciences, Manitoba Centre for Health Policy, Faculty of Medicine, Winnipeg, Canada. kozyrsk@umanitoba.ca
Insights
A new drug treatment-based asthma severity measure accurately classifies childhood asthma severity using health records. This reliable and valid tool helps track changes in asthma severity over time.
Area of Science:
- Pediatric Pulmonology
- Pharmacoepidemiology
- Health Services Research
Background:
- Accurate asthma severity measures are vital for pharmacoepidemiological research.
- Existing measures may not be suitable for large-scale administrative health data.
- Childhood asthma management requires validated severity assessment tools.
Purpose of the Study:
- To develop and validate a drug treatment-based asthma severity measure for childhood asthma.
- To assess the reliability, validity, and responsiveness of this measure using administrative data.
- To enable better pharmacoepidemiological studies of childhood asthma.
Main Methods:
- Developed a drug treatment-based severity measure following the stepped care approach.
- Applied the measure to a cohort of 16,862 children with asthma drug prescription use (1995-1996).
- Evaluated measure reliability, validity, and responsiveness to changes in severity.
Main Results:
- The measure classified asthma severity in 42% mild, 37% moderate, 19% moderate-severe, and 2% severe.
- Excellent agreement (kappa = 0.82) was found between successive time periods.
- Severe asthma classification correlated with higher hospitalization rates, specialist visits, and critical care needs.
Conclusions:
- A drug treatment-based asthma severity measure is reliable and valid for childhood asthma using prescription data.
- The measure is responsive to changes in asthma severity over time.
- This tool supports improved pharmacoepidemiological research and clinical management of childhood asthma.
Abstract:
Valid measures of severity are crucial in asthma pharmacoepidemiological research. This study reports the development and validation of a severity measure in childhood asthma for application to health care administrative data. A drug treatment-based asthma severity measure was developed following the stepped care approach to treatment, and this was applied to a cohort of 16,862 children who met a case definition for asthma drug prescription use between January 1995 and March 1996. Assessments were made of the measure's reliability, validity, and responsiveness to change over time. The drug treatment-based asthma severity measure classified 42% of children as having mild asthma, 37% as having moderate asthma, 19% as having moderate-severe asthma, and 2% as having severe asthma. Agreement on severity classification between two successive time periods was excellent (kappa = 0.82). Children classified as having severe asthma were significantly more likely than children with mild-moderate asthma to have previous asthma hospitalizations, to visit asthma specialists, to have high physician utilization, and to require hospital critical care. They were more likely to be reclassified as having severe asthma 2 years later. These findings show that a drug treatment-based severity measure in childhood asthma, which can be applied to prescription data, has good reliability and validity, and is responsive to changes in asthma severity over time.