Statistics

Question 0

Define class of recommendation I, IIa, IIb and III

Answer 0

I. Should be performed
IIa. Reasonable to perform
IIb. May be considered
III. Not useful, may be harmful

Question 1

Define levels of evidence A, B and C

Answer 1

A. Data derived from multiple randomised trials or meta analysis
B. Data from single randomised trial or no randomised studies
C. Consensus opinion or case studies