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Table 3 Differences in language inclusiveness based on subject area (i.e. Campbell Collaboration Review Group)

From: The prevalence of and factors associated with inclusion of non-English language studies in Campbell systematic reviews: a survey and meta-epidemiological study

Language category Number of reviews in each subject area (%)
Crime and Justicea International Developmenta Educationa Social Welfarea
LOE-restricted 11 0 3 1
(24.4) (0.0) (10.3) (1.7)
LOE-open 29 18 20 54
(64.4) (72.0) (69.0) (90.0)
LOE-inclusive 5 7 6 5
(11.1) (28.0) (20.7) (8.3)
Total reviewsb 45 (36.6) 25 (20.3) 29 (23.6) 60 (48.8)
Number of non-English studies includedb 13 (33.3) 21 (53.8) 18 (46.2) 8 (20.5)
  1. aThe Knowledge Transfer and Implementation group has been dropped from the table as it contains only a single LOE-open review
  2. bSome reviews, and their included non-English language studies, belong to more than one of the thematic groups and are therefore counted more than once