Analysis 2.1. Comparison 2 Results: Industry sponsorship by test treatment company versus sponsorship by comparator treatment company, Outcome 1 Number of studies with favorable test treatment efficacy results.. .. .. Analysis 3.1. Comparison 3 Conclusions: industry sponsored versus non-industry sponsored studies, Outcome

Sponsorship of drug and device studies by the manufacturing company leads to more favorable results and conclusions than sponsorship by other sources. Our analyses suggest the existence of an industry bias that cannot be explained by standard 'Risk of bias' assessments.

Analysis 2.1. Comparison 2 Results: Industry sponsorship by test treatment company versus sponsorship by comparator treatment company, Outcome 1 Number of studies with favorable test treatment efficacy results.. .. .. Analysis 3.1. Comparison 3 Conclusions: industry sponsored versus non-industry sponsored studies, Outcome

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