High frequency of spin bias in controlled trials of cannabis derivatives and their synthetic analogues: A meta-epidemiologic study

To investigate the frequency and perform a qualitative analysis of spin bias in publications of controlled trials assessing the therapeutic use of cannabis derivatives and their synthetic analogues.Meta-epidemiologic study carried out at the Universidade Federal de São Paulo, Brazil.A total of 65 publications with at least one efficacy primary outcome were considered. The results analysis for the primary outcome indicated statistically...