Table 1 RCT Recruitment Terminology
From: The external validity of published randomized controlled trials in primary care
Term | Definition |
|---|---|
Target population | Location and characteristics of potentially eligible individuals, representing the patient population to whom the results of the RCT are expected to apply |
Eligibility fraction | Proportion of potential participants who undergo screening and are eligible to enrol in the RCT |
Enrolment fraction | Proportion of people who are eligible for participation and who actually enrol in the RCT |
Recruitment fraction | Proportion of potential participants who actually enrol in the RCT |
Number of patients needed to be screened (NNS) | Number of patients screened in order to randomise one participant (equal to 1/recruitment fraction) |