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2018 ; 115
(1
): 607-611
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Home institution bias in the New England Journal of Medicine? A noninferiority
study on citation rates
#MMPMID29527075
Falk Delgado A
; Falk Delgado A
Scientometrics
2018[]; 115
(1
): 607-611
PMID29527075
show ga
Recently, in the four top journals of humanities, an institutional bias towards
publication of authors from Harvard and Yale was shown. The New England Journal
of Medicine (NEJM) is today the highest ranked general medical journal. It is
unknown if there exists institutional bias favoring publication of articles
originating from Harvard University, since the NEJM is produced by the
Massachusetts Medical Society with close connections to the Harvard University.
We examined if studies originating from the Harvard University published in the
NEJM were noninferior in terms of citation rates compared to articles with an
origin outside Harvard University. We evaluated original research articles
published in the NEJM in 2000 up until June 2001. A two-sample noninferiority
test based on the primary endpoint of citations was performed. Twenty-two studies
were affiliated to the Harvard University and 280 studies were not affiliated to
the Harvard University. The mean number of citations for Harvard affiliated
studies was 625 (95% CI 358-952, median 354) and for non-Harvard affiliated
studies 493 (95% CI 421-569, median 303). The mean difference was not
statistically different between affiliations, but fulfilled the requirements for
noninferiority [132 (95% CI - 138-402, P = 0.343), ? 200]. In summary, citation
rates were comparable between studies origination from the Harvard University
compared to non-Harvard Institutions. Based on these results there appears to be
low risk of institutional bias in the publishing process of original studies in
the NEJM.