Objective: The study aims to assess the status of registration of observational studies.Study Design and Setting: We identified studies on cancer research with prospective recruitment of participants that were registered from February 2000 to December 2011 in ClinicalTrials.gov. We recorded the dates of registration and start of recruitment, outcomes, and description of statistical method. We searched for publications corresponding to the registered studies through May 31, 2014.Results: One thousand one hundred nine registered studies were eligible. Primary and secondary outcomes were reported in 809 (73.0%) and 464 (41.8%) of them. The date of registration preceded the month of the study start in 145 (13.8%) and coincided in 205 (19.5%). A total of 151 publications from 120 (10.8%) registered studies were identified. In 2 (33.3%) of the 6 publications where ClinicalTrials.gov reported that the study started recruitment after registration, and in 9 (50.0%) of 18 publications where ClinicalTrials.gov reported the same date for registration and start of recruitment, the articles showed that the study had actually started recruiting before registration.Conclusion: During the period reviewed, few observational studies have been registered. Registration usually occurred after the study started, and prespecification of outcomes and statistical analysis rarely occurred. (C) 2016 Elsevier Inc. All rights reserved.

Registration practices for observational studies on ClinicalTrials.gov indicated low adherence

Flacco, Maria Elena;MANZOLI, Lamberto;
2016

Abstract

Objective: The study aims to assess the status of registration of observational studies.Study Design and Setting: We identified studies on cancer research with prospective recruitment of participants that were registered from February 2000 to December 2011 in ClinicalTrials.gov. We recorded the dates of registration and start of recruitment, outcomes, and description of statistical method. We searched for publications corresponding to the registered studies through May 31, 2014.Results: One thousand one hundred nine registered studies were eligible. Primary and secondary outcomes were reported in 809 (73.0%) and 464 (41.8%) of them. The date of registration preceded the month of the study start in 145 (13.8%) and coincided in 205 (19.5%). A total of 151 publications from 120 (10.8%) registered studies were identified. In 2 (33.3%) of the 6 publications where ClinicalTrials.gov reported that the study started recruitment after registration, and in 9 (50.0%) of 18 publications where ClinicalTrials.gov reported the same date for registration and start of recruitment, the articles showed that the study had actually started recruiting before registration.Conclusion: During the period reviewed, few observational studies have been registered. Registration usually occurred after the study started, and prespecification of outcomes and statistical analysis rarely occurred. (C) 2016 Elsevier Inc. All rights reserved.
Boccia, Stefania; Rothman, Kenneth J.; Panic, Nikola; Flacco, Maria Elena; Rosso, Annalisa; Pastorino, Roberta; Manzoli, Lamberto; La Vecchia, Carlo; Villari, Paolo; Boffetta, Paolo; Ricciardi, Walter; Ioannidis, John P. A.
File in questo prodotto:
File Dimensione Formato  
Manzoli L J Clin Epidemiol 2016.pdf

solo gestori archivio

Descrizione: Full text editoriale
Tipologia: Full text (versione editoriale)
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 469.51 kB
Formato Adobe PDF
469.51 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11392/2360479
Citazioni
  • ???jsp.display-item.citation.pmc??? 17
  • Scopus 30
  • ???jsp.display-item.citation.isi??? 28
social impact