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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Syst+Rev
2018 ; 7
(1
): 59
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Does information from ClinicalTrials gov increase transparency and reduce bias?
Results from a five-report case series
#MMPMID29661214
Adam GP
; Springs S
; Trikalinos T
; Williams JW Jr
; Eaton JL
; Von Isenburg M
; Gierisch JM
; Wilson LM
; Robinson KA
; Viswanathan M
; Middleton JC
; Forman-Hoffman VL
; Berliner E
; Kaplan RM
Syst Rev
2018[Apr]; 7
(1
): 59
PMID29661214
show ga
BACKGROUND: We investigated whether information in ClinicalTrials.gov would
impact the conclusions of five ongoing systematic reviews. METHOD: We considered
five reviews that included 495 studies total. Each review team conducted a search
of ClinicalTrials.gov up to the date of the review's last literature search,
screened the records using the review's eligibility criteria, extracted
information, and assessed risk of bias and applicability. Each team then
evaluated the impact of the evidence found in ClinicalTrials.gov on the
conclusions in the review. RESULTS: Across the five reviews, the number of
studies that had both a registry record and a publication varied widely, from
none in one review to 43% of all studies identified in another. Among the studies
with both a record and publication, there was also wide variability in the match
between published outcomes and those listed in ClinicalTrials.gov. Of the 173
total ClinicalTrials.gov records identified across the five projects, between 11
and 43% did not have an associated publication. In the 14% of records that
contained results, the new data provided in the ClinicalTrials.gov records did
not change the results or conclusions of the reviews. Finally, a large number of
published studies were not registered in ClinicalTrials.gov, but many of these
were published before ClinicalTrials.gov's inception date of 2000. CONCLUSION:
Improved prospective registration of trials and consistent reporting of results
in ClinicalTrials.gov would help make ClinicalTrials.gov records more useful in
finding unpublished information and identifying potential biases. In addition,
consistent indexing in databases, such as MEDLINE, would allow for better
matching of records and publications, leading to increased utility of these
searches for systematic review projects.
|*Bias
[MESH]
|*Clinical Trials as Topic
[MESH]
|*Databases, Factual
[MESH]
|*Information Storage and Retrieval/methods
[MESH]