Table 1 Operational definitions of trial- and intervention-related feasibility indicators
Category | Indicator | Definitiona | Search termsb | Outcomes |
|---|---|---|---|---|
Trial-Related Feasibility Indicators | Recruitment Capability | The proportion of eligible participants who are enrolled at baseline of the study. | Search was completed manually. Information typically provided in CONSORT diagrams. | Recruitment Capability (%) calculated as: \(\left(\frac{\# participants\ at\ baseline}{\# eligible\ participants}\right)\times 100\%\) |
Retention | The proportion of enrolled participants who are present throughout the full length of the treatment. | Search was completed manually. Information typically provided in CONSORT diagrams. | Retention (%) calculated as: \(\left(\frac{\# participants\ at\ treatment\ end}{\# participants\ at\ baseline}\right)\times 100\%\) | |
Intervention-Related Feasibility Indicators | Treatment Fidelityc | Content, frequency, duration, and coverage as originally intended | adhere*, deliver* | Deliverer adherence to the originally intended treatment plan |
Acceptability | The perception among participants’ that the treatment is agreeable or satisfactory. | accept*, appropriate*, enjoy*, satisf*, fun, safety, difficult*, tolera* | Participant-rated acceptability, satisfaction, enjoyment, perceptions of safety, difficulty, tolerability of treatment, number of adverse events | |
Attendancec | The proportion of total sessions offered to participants to the actual number of sessions participants attended. | attend*, engag*, | Attendance Rate (%) calculated as: \(\left(\frac{\# sessions\ participants\ attend}{\# sessions\ offered}\right)\times 100\%\) | |
Compliancec | Participants’ level of adherence to the content, frequency, duration, and coverage of the treatment as delivered by the research team. | comply, complian*, adhere* | Percentage of participants who complied with intervention procedures; Number of adaptations made by participants | |
Cost | Monetary costs associated with delivering the intervention to participants. | cost*, economic eval*, $, AUD, CAD, CHF, £, pound sterling, €, euro, ¥, yen | Monetary costs associated with the intervention |