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Table 3 Metrics for acceptability and feasibility outcomes

From: Adaptability and Resilience in Aging Adults (ARIAA): protocol for a pilot and feasibility study in chronic low back pain

Outcome Major revision prior to full trial and monitor closely Continue to full trial with modifications Continue to full trial without modifications
Trial acceptability
 Session-level engagement ° < 4 on a 9-point Likert scale, with 8 (0–8 range) representing the highest possible engagement. ° Score of 4 or 5 on a 9-point Likert scale. ° ≥ 6 on a 9-point Likert scale.
 Treatment credibility and expectancy ° < 5 on an 11-point Likert scale, with 10 (0–10 range) representing the highest level of credibility. ° Score of 5 to 7 on an 11-point Likert scale. ° ≥ 8 on an 11-point Likert scale.
 Satisfaction with intervention content ° < 2 on a 5-point Likert scale, with 4 (0–4 range) representing the highest degree of satisfaction with session content. ° Score of 2 on a 5-point Likert scale. ° ≥ 3 on a 5-point Likert scale.
 Global treatment satisfaction ° < 2 on a 4-point Likert scale, with 4 (1–4 range) representing the highest level of global treatment satisfaction. ° Score of 2 on a 4-point Likert scale. ° ≥ 3 on a 4-point Likert scale.
Trial feasibility
 Enrollment rates ° < 70% of participants who enroll commence treatment. ° 70–90% of participants who enroll commence treatment. ° > 90% of participants who enroll commence treatment.
 Participant retention ° < 70% participant retention by the 7-week time point. ° 70–80% participant retention by the 7-week time point. ° > 80% participant retention by the 7-week time point.
 Questionnaire feasibility ° < 80% completion of study questionnaires (treatment outcomes and mediators). ° 80–90% completion of study questionnaires. ° > 90% completion of study questionnaires.
 Home activity feasibility ° < 3 on a 7-point Likert scale, with 6 (0–6 range) representing the highest level of feasibility associated with home activity completion. ° Score of 3 or 4 on a 7-point Likert scale. ° ≥ 5 on a 7-point Likert scale.