Written action plan use in inner-city children: is it independently associated with improved asthma outcomes?

Background: Guidelines from the National Asthma Education and Prevention Program stipulate that multicomponent self-management interventions for asthma should include a written action plan (WAP). However the specific, independent effect of WAPs in improving outcomes remains unclear. Objective: To measure the association between WAP use during the previous year and improved asthma outcomes. Methods: We conducted a longitudinal quasi-experimental study using data from the Healthy Homes II (HH-II) randomized controlled trial in Seattle, WA. Action plan use during the previous year was measured at exit of HH-II. A participant was a WAP user if he used his action plan every day, almost every day, or once per week, and non-user if he did not meet these criteria. Sensitivity analyses explored less stringent criteria for WAP user designation. Prespecified outcomes were baseline-to-exit changes in asthma control in the previous 2 weeks, Pediatric Asthma Caregiver Quality of Life Scale score, and urgent health services utilization. We used robust linear and logistic regression to compare outcomes across groups. Results: Two hundred fifty-one patients participated: 112 WAP users; 139 non-users. After adjustment, no significant differences in outcomes were observed between WAP users and non-users. Among a subgroup of participants with recent urgent health services utilization, WAP users had better asthma control than non-users. Changing WAP user criteria to include those who simply owned an action plan, irrespective of use, did not alter our results. Conclusion: WAP use during the previous year was not associated with improved outcomes compared with non-use. Additional studies are needed to assess the long-term, independent benefit of this universally recommended intervention. Ann Allergy Asthma Immunol. 2011;107:207-213.