Journal article
Evolution of levels of evidence and strength of recommendations in medical research
Abstract
A systematic literature search and a comparative study were conducted to investigate the evolution of the levels of evidence and strength of recommendations in medical research. Fifty systems were included from 1979 to 2007, and 11 of these, which came from five states or international organizations, were selected and divided into three stages according to their characteristics, sphere of influence and application fields. Ideas about levels of …
Authors
Chen YL; Li YP; Du L; Wang L; Wen J; Yang XY
Journal
Chinese Journal of Evidence Based Medicine, Vol. 8, No. 2, pp. 127–133
Publication Date
February 1, 2008
ISSN
1672-2531