Table 2

Frequency of claims of ‘no treatment differences/effects’ in 2001/202 and 2016/207

Alderson and Chalmers1Gates and Ealing2Marson-Smith et al (unpublished)Marson-Smith et al (unpublished)
Reports analysedCochrane systematic reviewsRCTs reported in BMJ, JAMA, Lancet and New England Journal of MedicineCochrane systematic reviewsOther systematic reviews
Years sampled2001–20022016–201720172017
Number of reports analysed1212 (989+80+143)120640218
Number claiming ‘no difference’ or ‘no effect’259
Proportion claiming no difference or no effect (%)
  • RCT, randomised controlled trial.