Purpose
To describe effective retention strategies in a clinical trial with a high risk, low income, and vulnerable patient population with serious mental illness.
Design
Follow-up assessments were conducted for a randomized clinical tobacco treatment trial at 3-, 6-, and 12-months post-baseline. Initial follow-up rates of <40% at 3-months led to implementation of proactive retention strategies including obtaining extensive contact information; building relationships with case managers and social workers; contacting jails and prisons; text messaging, e-mailing, and messaging via social networking sites; identifying appointments via electronic medical record; and field outreach to treatment facilities, residences, and parks.
Setting
Large urban public hospital
Subjects
Participants were current smokers recruited from 100% smoke-free locked psychiatry units.
Measures
Assessments covered demographics, substance use, and mental health functioning.
Analysis
Retention rates were plotted over time in relation to key retention strategies. Chi-square and t-tests were used to examine participant predictors of retention at each follow-up. At the 12-month follow-up, the retention strategies that most frequently led to assessment completion were identified.
Results
The sample (N=100) was 65% male; age M=39.5 years (SD=11.3); 44% non-Hispanic White; 46% on Medicaid and 34% uninsured; 79% unemployed; and 48% unstably housed. Proactive retention strategies dramatically increased follow-up rates, concluding at 3-months=82.65%, 6-months=89.69%, and 12-months=92.78%. Married and divorced/separated/widowed participants, those with higher income, and participants with alcohol or illicit drug problems had increased retention from 3 to 12-months follow-up.
Conclusion
Follow-up rates improved as proactive methods to contact participants were implemented. Dedicated research staff, multiple methods, community networking, and outreach within drug treatment settings improved retention.