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Table 2 Extracted information to evaluate the research question

From: Association of industry sponsorship and positive outcome in randomised controlled trials in general and abdominal surgery: protocol for a systematic review and empirical study

Funding source [Industry/independent]
Experimental intervention is reported to be superior to the control intervention [Yes/no]
Exact p value of the primary endpoint [n]
Year of publication [n]
Impact factor of journal [n]
Region [National/multinational]
Number of study centres [n]
Sample size [n]
Concluded superiority without statisticalsignificance of primary endpoint [Yes/no]
Risk of bias for primary endpoint according to Cochrane Collaboration’s tool for assessing risk of bias [Low/high/unclear]