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Table 5 Number of digital retention tools that CTUs mentioned they have experience of in relation to retention, broken down by category

From: Using digital tools in the recruitment and retention in randomised controlled trials: survey of UK Clinical Trial Units and a qualitative study

Retention toolsn (%)
SMS / email reminders17 (59)
Study websites3 (10)
Apps and web-based data collection3 (10)
Social media2 (7)
Other – in-house4 (14)
  1. CTU Clinical Trials Unit