Objective:

To examine whether participant characteristics, particularly preintervention social contact, were associated with changes in loneliness during a digital social robot intervention.

Approach:

• Design and participants: Secondary analysis of intervention-phase data from an RCT. The analysis included 67 community-dwelling adults aged 65 years or older who lived alone in Tokyo or nearby areas and reported loneliness.
• Intervention and outcome: Participants received a 4-week program using an operator-mediated humanoid robot for personalized voice communication. Loneliness change was measured with the 20-item UCLA Loneliness Scale, version 3; negative change scores indicated reduced loneliness.
• Analysis: Multiple linear regression assessed associations between loneliness change and social contact, baseline loneliness, and demographic and health characteristics. Models were run without and with an interaction between social contact and baseline loneliness.

Key Findings:

• The supplied article context reports that 67 participants had preintervention and postintervention loneliness data; 64 (94%) were female, and mean age was 82.3 years (SD 6.5).
• The provided context ends before the results of the regression analyses, so it does not report which participant factors were associated with loneliness reduction.

Interpretation:

This secondary analysis was designed to investigate variation in loneliness change during the intervention, including whether less frequent preintervention social contact was associated with greater reductions. The supplied context does not provide findings that establish these associations.

Limitations:

• The analysis used intervention-phase data from a previously conducted RCT and pooled participants from immediate and delayed intervention sequences, adjusting for sequence.
• The supplied context does not include the complete results or regression estimates, limiting assessment of the reported associations.

Conclusion:

The study examined participant characteristics associated with loneliness change during a 4-week digital social robot intervention, but the available context does not state the analysis results.