Obesidad

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Scottish Intercollegiate Guidelines Network
Part of NHS Quality Improvement Scotland

SIGN

115

Management of Obesity
A national clinical guideline

February 2010

KEY TO EVIDENCE STATEMENTS AND GRADES OF RECOMMENDATIONS
LEVELS OF EVIDENCE 1++ High quality meta-analyses, systematic reviews of RCTs, or RCTs with a very low risk of bias 1+ 1Well conducted meta-analyses,systematic reviews, or RCTs with a low risk of bias Meta-analyses, systematic reviews, or RCTs with a high risk of bias High quality case control or cohort studies with a very low risk of confounding or bias and a high probability that the relationship is causal 2+ 23 4 Well conducted case control or cohort studies with a low risk of confounding or bias and a moderate probability that therelationship is causal Case control or cohort studies with a high risk of confounding or bias and a significant risk that the relationship is not causal Non-analytic studies, eg case reports, case series Expert opinion

2++ High quality systematic reviews of case control or cohort studies

GRADES OF RECOMMENDATION Note: The grade of recommendation relates to the strength of theevidence on which the recommendation is based. It does not A At least one meta-analysis, systematic review, or RCT rated as 1++, and directly applicable to the target population; or A body of evidence consisting principally of studies rated as 1+, directly applicable to the target population, and demonstrating overall consistency of results B A body of evidence including studies rated as2++, directly applicable to the target population, and demonstrating overall consistency of results; or Extrapolated evidence from studies rated as 1++ or 1+ C A body of evidence including studies rated as 2+, directly applicable to the target population and demonstrating overall consistency of results; or Extrapolated evidence from studies rated as 2++ D Evidence level 3 or 4; orExtrapolated evidence from studies rated as 2+ GOOD PRACTICE POINTS Recommended best practice based on the clinical experience of the guideline development group. NHS Quality Improvement Scotland (NHS QIS) is committed to equality and diversity and assesses all its publications for likely impact on the six equality groups defined by age, disability, gender, race, religion/belief and sexualorientation. SIGN guidelines are produced using a standard methodology that has been equality impact assessed to ensure that these equality aims are addressed in every guideline. This methodology is set out in the current version of SIGN 50, our guideline manual, which can be found at www.sign.ac.uk/guidelines/fulltext/50/index.html The EQIA assessment of the manual can be seen atwww.sign.ac.uk/pdf/sign50eqia.pdf The full report in paper form and/or alternative format is available on request from the NHS QIS Equality and Diversity Officer. Every care is taken to ensure that this publication is correct in every detail at the time of publication. However, in the event of errors or omissions corrections will be published in the web version of this document, which is thedefinitive version at all times. This version can be found on our web site www.sign.ac.uk

This document is produced from elemental chlorine-free material and is sourced from sustainable forests.

Scottish Intercollegiate Guidelines Network

Management of obesity
A national clinical guideline

February 2010

MANAGEMENT OF OBESITY

ISBN 978 1 905813 57 5 Published February2010 SIGN consents to the photocopying of this guideline for the purpose of implementation in NHSScotland Scottish Intercollegiate Guidelines Network Elliott House, 8 -10 Hillside Crescent Edinburgh EH7 5EA www.sign.ac.uk

CONTENTS

Contents
1 1.1 1.2 1.3 1.4 1.5 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 3 3.1 3.2 4 4.1 4.2 4.3 4.4 4.5 5 5.1 5.2 5.3 5.4 Introduction...
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