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Table 1.4Classification (grading) of recommendations for intervention studies

GradeEvidence
A
B
  • A body of evidence that includes studies rated as 2++, is directly applicable to the target population and demonstrates overall consistency of results, or
  • extrapolated evidence from studies rated as 1++ or 1+.
C
  • A body of evidence that includes studies rated as 2+, is directly applicable to the target population and demonstrates overall consistency of results, or
  • extrapolated evidence from studies rated as 2++.
D
  • Evidence level 3 or 4, or
  • extrapolated evidence from studies rated as 2+, or
  • formal consensus.
D (GPP)

From: 1, Introduction

Cover of Urinary Incontinence
Urinary Incontinence: The Management of Urinary Incontinence in Women.
NICE Clinical Guidelines, No. 40.
National Collaborating Centre for Women's and Children's Health (UK).
London: RCOG Press; 2006 Oct.
Copyright © 2006, National Collaborating Centre for Women’s and Children’s Health.

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