Table 2

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

Alderson and Chalmers1 Gates and Ealing2 Marson-Smith et al (unpublished)Marson-Smith et al (unpublished)
Reports analysedCochrane systematic reviewsRCTs reported in BMJ, JAMA, Lancet and New England Journal of Medicine Cochrane 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.