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Adherence to protocol registration of systematic reviews published in high-impact-factor journals: meta-epidemiological study

Adherence to protocol registration of systematic reviews published in high-impact-factor journals: meta-epidemiological study - Adherence to protocol registration of systematic reviews published in high-impact-factor journals: meta-epidemiological study

Status
Active, not recruiting
Phases
Unknown
Study type
Unknown
Source
JPRN
Registry ID
JPRN-UMIN000018189
Enrollment
1
Registered
2015-07-07
Start date
2015-07-07
Completion date
Unknown
Last updated
2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

[Criteria for considering studies for this review] We will include any systematic reviews or meta-analysis for interventions. Studies will be excluded if the reviews are for diagnostic test accuracy, non-randomized studies or meta-epidemiology. Eligibility will be assessed by two authors (H.T and Y.T.) independently. Differences regarding eligibility will be resolved by consensus and with the help of the senior author (Y.K.). [Data collection and analysis] [Selection of studies] We will st

Interventions

None listed

Sponsors

Hyogo Prefectural Amagasaki General Medical Center
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: [inclusion criteria] the 10 journals classified by the Journal Citation Reports 2013 as general internal medicine journal associated with the highest impact factors [Data extraction and management] Two authors (H.T. and Y.T.) will review titles and abstracts identified by the searches independently. They will independently detect protocol registration information from abstract or full text if needed. In addition, each author will check reference of the PRISMA statement.. Disagreements will be resolved by consensus and with the help of the senior investigator (Y.K.). [Searches] [Search method] We will select the 10 journals classified by the Journal Citation Reports 2013 as general internal medicine journal associated with the highest impact factors; we will exclude the Cochrane Database of Systematic Reviews because protocol registration is strictly performed in articles published in the database. We will search MEDLINE (source, PubMed, between August 1st 2009 and June 30th 2015) using the journal names and "Search Strategy Used to Create the Systematic Reviews Subset on PubMed" last modified February 2015; the search will be not subject to language restrictions. We will select systematic reviews for any randomized intervention. We will exclude systematic reviews for diagnostic test accuracy and systematic reviews for non-randomized observational studies

Exclusion criteria

Exclusion criteria: the Cochrane Database of Systematic Reviews

Design outcomes

Primary

MeasureTime frame
[Primary Outcome] Adherence to protocol registration—

Secondary

MeasureTime frame
[Secondary Outcome] 1. Number of systematic reviews that refer directly to PRISMA statement 2. Adherence to protocol registration among systematic reviews that refer directly to the PRISMA statement 3. Publication bias in each registered and unregistered systematic reviews—

Countries

Japan

Contacts

Public ContactTSUJIMOTO Hiraku

Hyogo Prefectural Amagasaki General Medical Center Hospital Care Research Unit

hira.to.ber3598@gmail.com+816-6480-7000

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026