ED PLWD/Care Partner Text Messaging

Enrollment rate will be used to assess Feasibility.

Message engagement, assessed via text message response and interaction metrics, will be used to assess Feasibility.

Engagement will be operationalized through quantitative metrics including (1) the number of text messages delivered, (2) the number and proportion of text messages that received responses from care partners, (3) the time-to-response for interactive messages, and (4) the number of unique interactions per participant over the 30-day intervention period. These metrics will be captured via backend system logs of the text messaging platform used to deliver the intervention.

Participant retention at 30 days post-enrollment, assessed through completion of final follow-up assessment

Retention is defined as the proportion of enrolled care partners who remain active in the study and complete the 30-day follow-up assessment. Completion is operationalized as successfully providing outcome data through a structured telephone-based survey at the end of the 30-day intervention period. This includes response to caregiver-reported outcome measures collected by the research team (e.g., burden, satisfaction, preparedness).

Retention rate will be calculated as a percentage:

(# of participants who complete the 30-day follow-up ÷ total number enrolled) × 100.

Participants lost to follow-up or who withdraw consent prior to completing the final assessment will be considered non-retained.

The System Usability Scale (SUS) will be used to assess the usability of the CAPTURE text message intervention. The SUS is a validated 10-item questionnaire that measures perceived ease of use, efficiency, and satisfaction with a digital system. Each item is rated on a 5-point Likert scale (1 = strongly disagree to 5 = strongly agree), and item scores are converted to yield a total score ranging from 0 to 100, with higher scores indicating better usability.

The SUS total score will be calculated for each participant at the 30-day follow-up. Mean and distributional statistics will be reported for the intervention group.

Acceptability of the CAPTURE text message intervention will be assessed through a structured participant satisfaction survey and open-ended qualitative feedback. The survey includes multiple items rated on a 5-point Likert scale ranging from 1 (Strongly Disagree) to 5 (Strongly Agree), with higher scores indicating greater acceptability and satisfaction. Domains assessed include overall satisfaction, perceived helpfulness, relevance, and willingness to recommend the intervention to others.

In addition, participants will be invited to provide brief qualitative comments via open-ended items assessing their experience and suggestions for improvement. Quantitative results will be summarized using descriptive statistics, and qualitative feedback will be analyzed using thematic content analysis.

Preparedness for Caregiving Scale to assess Care partner preparedness. Total score range 0 to 32. Higher scores indicate greater perceived readiness for caregiving.

Zarit Burden Interview, self-efficacy scales used to assess Emotional well-being and burden. Total score 0-88, higher scores indicate more severe burden.

Return healthcare utilization assessed as mean number ED revisits