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Table 3 Relationship between data-sharing policies and journal impact factors and the number of RCT during the study period grouped by quartiles

From: Research transparency promotion by surgical journals publishing randomised controlled trials: a survey

 

Inclusion of data-sharing statement policy

Total

Mandatory

Optional

Not available

P value

n = 82

n = 4

n = 37 (%)

n = 41

Number of RCT published during the study period

    

0.47

 [0–4]

19 (23%)

0 (0%)

8 (42%)

11 (58%)

 

 [5–10]

22 (27%)

1 (5%)

9 (41%)

12 (55%)

 

 [11–19]

20 (24%)

3 (15%)

9 (45%)

8 (40%)

 

 [21–65]

21 (26%)

0 (0%)

11 (52%)

10 (48%)

 

2017 journal impact factor

    

0.20

 [2.03–2.47]

21 (26%)

0 (0%)

13 (62%)

8 (38%)

 

 [2.48–2.97]

20 (24%)

0 (0%)

9 (45%)

11 (55%)

 

 [2.98–3.76]

20 (24%)

1 (5%)

9 (45%)

10 (50%)

 

 [3.77–9.20]

21 (26%)

3 (14%)

6 (29%)

12 (57%)