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Table 3 Types of publication constraints described for included trials

From: Are investigators’ access to trial data and rights to publish restricted and are potential trial participants informed about this? A comparison of trial protocols and informed consent materials

Type of publication constraints

N = 42

Publication not allowed for a pre-specified time period

22 trials (52%)

Sponsor can review potential publications or presentations

30 trials (71%)

Sponsor can comment, but investigators must not comply with comments

14 trials (33%)

Sponsor can comment, and investigators must comply with comments

13 trials (31%)

Sponsor can delay publication

21 trials (50%)