Abstract

Objectives

To determine how quickly randomised controlled trials funded by the Health Research Council of New Zealand (HRC) were registered and published, and whether time to publication differed by trial result.

Design

We created a retrospective cohort of trials offered funding from 1999 to 2017 by seeking lists of candidate studies using the Official Information Act 1982. These lists were supplemented by searching the HRC’s online research repository and an open-access database on Figshare. One investigator searched for trial registrations and for dissemination using electronic databases, university websites and ResearchGate. One investigator extracted data from the obtained studies and a second investigator independently corroborated the data entry from a 10% random sample.

Results

We identified 258 trials that were offered funding, 252 trials were conducted and 229 (90.9%) were registered, 179 prospectively by the date of the final search (24 March 2022). Overall, 236 trials were completed by the date of the last search and in 209 (88.6%) trials the results had been disseminated, 200 (84.7%) of which were by journal publication. We obtained the results for 214 trials, 91 (42.5%) of which were positive, 120 (56.1%) of which were null and 3 (1.4%) of which were negative. Median time to publication was 22.7 months for positive trials and 21.5 months for combined null or negative trials (log rank test p=0.83). Median time since trial completion in the trials that had not been published was 43.6 months (IQR 17.1–108.2 months).

Conclusions

Between 1999 and 2017, almost 9 out of every 10 HRC-funded trials had been registered and a similar proportion of completed trials had been published with no difference in time to publication based on type of result. However, only a slim majority of trials had published within the 2-year time frame set by the WHO.

Details

Title
Trial registration and time to publication in a retrospective cohort of publicly funded randomised controlled trials in New Zealand 1999–2017
Author
Jull, Andrew 1   VIAFID ORCID Logo  ; Walker, Natalie 2 

1  School of Nursing, The University of Auckland, Auckland, New Zealand; National Institute for Health Innovation, The University of Auckland, Auckland, New Zealand 
2  National Institute for Health Innovation, The University of Auckland, Auckland, New Zealand 
First page
e065050
Section
Research methods
Publication year
2022
Publication date
2022
Publisher
BMJ Publishing Group LTD
e-ISSN
20446055
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1136/bmjopen-2022-065050
ProQuest document ID
2724151889
Copyright
© 2022 Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ. http://creativecommons.org/licenses/by-nc/4.0/ This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See:  http://creativecommons.org/licenses/by-nc/4.0/ . Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.