Table 1

The 2-year citation averages for open access versus subscription journals, calculated using Web of Science or Scopus data

Source

Type

Journals (n)

Journal level

Article level


Mean

SD

Mean

SD


Journal Citation Reports 2-year citation average

Subscription

7,609

1.97

2.95

2.81

3.31

Open access

610

1.50

4.02

2.04

2.28

Scopus 2-year citation average

Subscription

11,124

0.85

1.38

1.59

1.99

Open access

1,327

0.61

1.85

1.03

1.44


In the journal level calculations each journal has equal weight; in the article level calculations the impact factors for the journals are weighted by their publication volumes.

Bj√∂rk and Solomon BMC Medicine 2012 10:73   doi:10.1186/1741-7015-10-73

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