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Table 1 Illustrating how the terms trial, record, and variant are used

From: Previously unidentified duplicate registrations of clinical trials: an exploratory analysis of registry data worldwide

Trial Record Variant
SPD557-206 (Shire Plc) EUCTR2011-004388-62 EUCTR2011-004388-62-BE
   EUCTR2011-004388-62-CZ
   EUCTR2011-004388-62-DE
   EUCTR2011-004388-62-HU
   EUCTR2011-004388-62-LV
   EUCTR2011-004388-62-PL
  NCT01472939 NCT01472939
  1. A trial registered in both the European Union Clinical Trials Register (EUCTR) and ClinicalTrials.gov illustrates the distinction we make between a trial, a record, and a variant. A trial may have been registered in more than one registry, resulting in multiple records. An EUCTR record may have been registered in multiple member states, resulting in multiple variants of that record