“4S” levels of organisation of evidence from research

Haynes B Evid Based Nurs 2005; 8:4-6

©2005 by BMJ Publishing Group Ltd and RCN Publishing Company Ltd

 The “5S” levels of organisation of evidence from healthcare research.

Haynes B Evid Based Nurs 2007;10:6-7

©2007 by BMJ Publishing Group Ltd and RCN Publishing Company Ltd

The 6S hierarchy of pre-appraised evidence

DiCenso A et al. Evid Based Nurs 2009;12:99-101

©2009 by BMJ Publishing Group Ltd and RCN Publishing Company Ltd