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Table 3 Information about the primary publication reported in the non-primary publication

From: Reporting characteristics of non-primary publications of results of randomized trials: a cross-sectional review

 

Overall (n = 69)

Comparison as randomized (n = 42)

Comparison not as randomized (n = 27)

Number of citations relating to primary publication

 Cites protocol onlya

6 (9%)

1 (2%)

5 (19%)

 Cites primary publication only

33 (48%)

21 (50%)

12 (44%)

 Cites protocol and primary publication

19 (27%)

12 (29%)

7 (26%)

 Cites multiple publications

11 (16%)

8 (19%)

3 (11%)

Identified main outcome of primary publication

 Reported

27 (39%)

20 (48%)

7 (26%)

 Not reported

42 (61%)

22 (52%)

20 (74%)

Numerical results reported for main outcome of primary publication

 Reported

4 (6%)

4 (10%)

0

 Not reported

65 (94%)

38 (90%)

27 (100%)

Method of randomization

 Reported

6 (9%)

4 (10%)

2 (7%)

 Not reported

63 (91%)

38 (90%)

25 (93%)

  1. aNumber of citations relating to primary publication: primary publication not published at time of non-primary publication (n = 1).