Results Reporting

Including non-tabular EUCTR formats increased detected results availability. ClinicalTrials.gov and EUCTR support structured tabular results, while EUCTR also permits uploaded synopses and reports. Registries differ in the formats they provide for capturing trial results. In EUCTR–DRKS pairs, results availability was driven entirely by EUCTR because DRKS lacks a comparable structured format. EUCTR was the dominant route for results reporting in the assessed cross-registrations. Trials with results only on EUCTR would appear unreported if monitoring consulted only ClinicalTrials.gov or DRKS.