Study attributes
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For studies it is useful to provide a basic categorisation of their current recruiting status, to give an idea of where the study is within the normal life cycle. This data is often available from trial registry entries.
The options in the NDR system are taken from the largest such registry, ClinicalTrials.gov, (from its overall_status field, which appears to be a combination of the overall recruitment data point and the availability of the relevant data). They are listed below:
| id | name | description | source |
|---|---|---|---|
| 11 | Withdrawn | Study halted prematurely, prior to enrolment of first participant. | ClinicalTrials.gov |
| 12 | Available | Recruitment status available on request but no details provided. | ClinicalTrials.gov |
| 13 | Withheld | Recruitment status not provided. | ClinicalTrials.gov |
| 14 | Recruiting | Participants are currently being recruited, whether or not any participants have yet been enrolled. | ClinicalTrials.gov |
| 15 | Active, not recruiting | Study is continuing, meaning participants are receiving an intervention or being examined, but new participants are not currently being recruited or enrolled. | ClinicalTrials.gov |
| 16 | Not yet recruiting | Participants are not yet being recruited. | ClinicalTrials.gov |
| 17 | No longer available | Recruitment status no longer available. | ClinicalTrials.gov |
| 18 | Suspended | Study halted prematurely but potentially will resume. | ClinicalTrials.gov |
| 19 | Enrolling by invitation | Participants are being (or will be) selected from a predetermined population. | ClinicalTrials.gov |
| 20 | Approved for marketing | The study has concluded and the medical agent that was the focus of the study has been approved for marketing (in the US). | ClinicalTrials.gov |
| 21 | Completed | The study has concluded normally; participants are no longer receiving an intervention or being examined (that is, last participant’s last visit has occurred). | ClinicalTrials.gov |
| 22 | Terminated | Study halted prematurely and will not resume; participants are no longer being examined or receiving intervention. | ClinicalTrials.gov |
| 0 | Unknown status | Status information not provided. | ClinicalTrials.gov |
