Differential attrition in a caregiver skill training trial

Area of Science:

• Gerontology
• Clinical Psychology
• Neurology

Background:

• Participant attrition in randomized trials can compromise statistical power and introduce bias.
• Elective withdrawals, a significant component of attrition, are often underreported in trial publications.
• Understanding factors influencing caregiver withdrawal is crucial for improving clinical trial integrity.

Purpose of the Study:

• To investigate factors associated with elective participant withdrawals in a randomized trial focused on Alzheimer's disease (AD) and Parkinson's disease (PD) caregivers.
• To identify specific caregiver subgroups at higher risk of early withdrawal from clinical trials.

Main Methods:

• Survival analysis was employed to examine elective withdrawals among the first 131 participants in Project ASSIST.
• The study analyzed data from caregivers of individuals with AD and PD enrolled in a skill training intervention trial.
• Baseline covariates were controlled to isolate the impact of caregiver type and relationship status on withdrawal timing.

Main Results:

• Approximately 11% (14 out of 131) of participants electively withdrew before completing final assessments.
• Alzheimer's disease caregivers and non-spousal caregivers demonstrated significantly earlier withdrawal patterns compared to Parkinson's disease and spousal caregivers.
• These differences persisted even after adjusting for baseline participant characteristics.

Conclusions:

• Caregiver characteristics, specifically disease type (AD vs. PD) and relationship status (spousal vs. non-spousal), significantly influence elective withdrawal timing in clinical trials.
• Findings underscore the need for tailored participant engagement and retention strategies in caregiver intervention trials.
• Optimizing trial design to accommodate diverse caregiver needs may enhance participant adherence and study validity.