Additional file 3: of Identifying research priorities for effective retention strategies in clinical trials

Table S1 Compilation of Delphi survey list for round 1. Table S2 Retention strategies within the initial CTU survey but not included in the subsequent Delphi survey. Table S3 Respondents to the survey of HTA-funded trials. Table S4 Contextual data extracted from protocols and survey responses. Table S5 Anticipated causes of missing data at trial design (Question 5). Table S6 Differences between the observed and anticipated levels of missing data (Question 8). Table S7 Effective practices for mitigating missing data recommended from trialists (Question 13). Table S8 Frequency of CTUs usually adjusting their sample size for missing data (Question 2). Table S9 What informs the level of attrition adjustment in the sample size calculation? (Question 2). (DOCX 40 kb)