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Table 1 Number of systematic reviews that searched for and included non-English studies, unpublished studies, and dissertations

From: Grey literature in systematic reviews: a cross-sectional study of the contribution of non-English reports, unpublished studies and dissertations to the results of meta-analyses in child-relevant reviews

Review Group

Total number of SRs

Number that searched for study typea

N (%)

Number that included study typea

N (%)

Total number of studies included in SR

Total number of study typea included

N (%)

Non-English Studies

ā€ƒARI

57

57 (100)

11 (19.3)

398

28 (7.0)

ā€ƒID

38

38 (100)

4 (10.5)

238

6 (0.8)

ā€ƒDPLP

34

33 (97.1)

0 (0.0)

144

0 (0.0)

ā€ƒTotal

129

128 (99.2)

15 (11.7)

780

34 (4.4)

Unpublished studies

ā€ƒARI

57

55 (96.5)

5 (7.3)

398

11 (2.8)

ā€ƒID

38

38 (100)

2 (5.3)

238

3 (1.3)

ā€ƒDPLP

34

31 (91.2)

1 (3.2)

144

1 (0.7)

ā€ƒTotal

129

124 (96.1)

8 (5.6)

780

15 (1.9)

Dissertations

ā€ƒARI

57

5 (8.8)

1 (20.0)

398

2 (0.5)

ā€ƒID

38

1 (2.6)

1 (100)

238

2 (0.8)

ā€ƒDPLP

34

22 (64.7)

7 (31.8)

144

11 (7.6)

ā€ƒTotal

129

28 (21.7)

9 (32.1)

780

15 (1.9)

  1. ARI acute respiratory infections, ID infectious diseases, DPLP developmental, psychosocial and learning problems, SR systematic review
  2. astudy type refers to Non-English, unpublished, or dissertation