User Tools

Site Tools


evidence based medicine (EBM)

levels of evidence

  • Level I: Evidence obtained from at least one properly designed randomized controlled trial.
  • Level II-1: Evidence obtained from well-designed controlled trials without randomization.
  • Level II-2: Evidence obtained from well-designed cohort or case-control analytic studies, preferably from more than one center or research group.
  • Level II-3: Evidence obtained from multiple time series with or without the intervention. Dramatic results in uncontrolled trials might also be regarded as this type of evidence.
  • Level III: Opinions of respected authorities, based on clinical experience, descriptive studies, or reports of expert committees.

classes of recommendations

class I evidence &/or general agreement that Rx or procedure is beneficial, useful and effective
class II conflicting evidence or opinion regarding usefulness or effectiveness
class IIa weight of evidence is in favour of usefulness or effectiveness
class IIb usefulness or effectiveness is less well established
class III not recommended as evidence or opinion suggests NOT useful or effective, and may cause harm


examples of EBM in this wiki

ebm.txt · Last modified: 2014/04/13 05:44 by

Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki