Table 1 Feasibility indicators
Feasibility | Indicator | Criteria for success |
|---|---|---|
Process | ||
 Recruitment rate | # of subjects/week recruited | Mean 1 subject/week |
 Retention rate | % of subjects with retention data | Complete retention > 80% of subjects |
 Perceived benefit | Satisfaction survey |  > 85% will be agree or strongly agree |
Resources | ||
 Treatment fidelity and adherence | Participate in all VR sessions |  > 85% of subjects |
 Subject and tester burden | Assessments |  > 85% of subjects complete in ≤ 60 min |
 Trainer burden | Time spent administering the program | Mean VR session is 30 min |
Management | ||
 Equipment | Downtime due to technical issues of VR equipment |  > 85% of subjects without any downtime |
 Processing time | Time from initial contact to enrolment | Mean time is < 5 days |
Scientific | ||
 Safety | Adverse events from the program activities/advice, or assessments | No major injuries or adverse events reported |
 Treatment response | ANCOVA comparison between groups | Significant group difference in primary clinical outcome |
 Treatment effect | Estimate of effect size and variance for future sample size calculations | Data on all relevant variables |