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Journal of Pediatric Psychology, Vol. 28, No. 8, 2003, pp. 519-528
© 2003 Society of Pediatric Psychology

Predicting Attrition in a Pediatric Asthma Intervention Study

Kathy Zebracki, MA1, Dennis Drotar, PhD2, H. Lester Kirchner, PhD2, Mark Schluchter, PhD2, Susan Redline, MD2, Carolyn Kercsmar, MD2 and Natalie Walders, PhD3

1 Case Western Reserve University, Cleveland, Ohio, 2 Rainbow Babies and Children's Hospital, Cleveland, Ohio, and Case Western Reserve University School of Medicine, 3 Rhode Island Hospital, Brown Medical School

All correspondence concerning this article should be addressed to Kathy Zebracki, Department of Psychology, Case Western Reserve University, 11220 Bellflower Rd., Cleveland, Ohio 44106. E-mail: kmz7{at}po.cwru.edu.

Objectives To operationalize a comprehensive description of attrition, including pre-inclusion, dropout, and attrition due to intermittent missing data, and to test a predictive model of attrition using a data set from a randomized controlled intervention in pediatric asthma. Methods Participants included children, ages 4–12, diagnosed with asthma and their caregivers. Demographic variables and outcome measures of asthma morbidity were examined in 327 families to determine their association with attrition. Results Families who did not complete randomization and the intervention tended to have younger caregivers than did completers. Caregiver age emerged as the most consistent predictor of pre-inclusion and dropout attrition. There were no significant predictors of attrition due to intermittent missing data. Conclusion Younger caregivers may be at particular risk for attrition in pediatric asthma intervention studies and warrant special attention by investigators.

Key words: attrition; pediatric asthma; intervention.


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