Study selection
Inclusion criteria for the study required studies to be relevant to
women’s or newborn health (defined as the first 28 days after birth).
All stages of COS development were eligible, including registered
entries, protocols, systematic reviews or published COS. In the COMET
database, studies can be registered either as a COS development process
or as a standalone systematic review, exploring outcome reporting across
systematic reviews, randomized trials, observational studies, or
qualitative studies. These systematic reviews may or may not be part of
an overall core outcome study. We included all studies registered as
part of a COS or systematic review. Entries from the previous systematic
review(11) were identified and progression from their status was
explored from protocol to systematic review to core outcome set
publication.
Two authors (KG & BD) independently screened all eligible records based
on title and summary in the general information section of the COMET
database and the title and description on the CROWN database. Any
discrepancies were resolved through discussion between authors and
retrieval of the full text article if the summary or discussion were
unclear. For all studies meeting the inclusion criteria, full text
articles were retrieved, where available.