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Contents
Preface xiii
Acknowledgements xv
The Handbook editors xvii
Major contributors xix
Part 1 COCHRANE REVIEWS 1
1 Introduction 3
Sally Green, Julian PT Higgins, Philip Alderson, Mike Clarke, Cynthia D Mulrow
and Andrew D Oxman
1.1 The Cochrane Collaboration 3
1.2 Systematic reviews 6
1.3 About this Handbook 7
1.4 Contributors to the Handbook 8
1.5 Chapter information 9
1.6 References 9
2 Preparing a Cochrane review 11
Edited by Sally Green and Julian PT Higgins
2.1 Rationale for protocols 11
2.2 Format of a Cochrane review 12
2.3 Logistics of doing a review 13
2.4 Publication of Cochrane reviews in print journals and books 24
2.5 Publication of previously published reviews as Cochrane reviews 26
2.6 Declaration of interest and commercial sponsorship 26
2.7 Chapter information 29
2.8 References 29
3 Maintaining reviews: updates, amendments and feedback 31
Julian PT Higgins, Sally Green and Rob JPM Scholten
3.1 Introduction 31
3.2 Some important definitions 32
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3.3 Important dates associated with Cochrane reviews 39
3.4 Considerations when updating a Cochrane review 42
3.5 ‘What’s new’ and History tables 46
3.6 Incorporating and addressing feedback in a Cochrane review 48
3.7 Chapter information 48
3.8 References 49
4 Guide to the contents of a Cochrane protocol and review 51
Edited by Julian PT Higgins and Sally Green
4.1 Introduction 52
4.2 Title and review information (or protocol information) 52
4.3 Abstract 55
4.4 Plain language summary 55
4.5 Main text 55
4.6 Tables 70
4.7 Studies and references 72
4.8 Data and analyses 74
4.9 Figures 76
4.10 Sources of support to the review 77
4.11 Feedback 77
4.12 Appendices 78
4.13 Chapter information 78
4.14 References 78
Part 2 GENERAL METHODS FOR COCHRANE REVIEWS 81
5 Defining the review question and developing criteria for
including studies 83
Edited by Denise O’Connor, Sally Green and Julian PT Higgins
5.1 Questions and eligibility criteria 84
5.2 Defining types of participants: which people and populations? 85
5.3 Defining types of interventions: which comparisons to make? 86
5.4 Defining types of outcomes: which outcome measures are most important? 87
5.5 Defining types of study 90
5.6 Defining the scope of a review question (broad versus narrow) 91
5.7 Changing review questions 93
5.8 Chapter information 93
5.9 References 94
6 Searching for studies 95
Carol Lefebvre, Eric Manheimer and Julie Glanville on behalf of the Cochrane
Information Retrieval Methods Group
6.1 Introduction 96
6.2 Sources to search 98
6.3 Planning the search process 118
6.4 Designing search strategies 128
6.5 Managing references 142
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6.6 Documenting and reporting the search process 144
6.7 Chapter information 146
6.8 References 147
7 Selecting studies and collecting data 151
Edited by Julian PT Higgins and Jonathan J Deeks
7.1 Introduction 151
7.2 Selecting studies 152
7.3 What data to collect 156
7.4 Sources of data 163
7.5 Data collection forms 164
7.6 Extracting data from reports 167
7.7 Extracting study results and converting to the desired format 170
7.8 Managing data 182
7.9 Chapter information 183
7.10 References 183
8 Assessing risk of bias in included studies 187
Edited by Julian PT Higgins and Douglas G Altman on behalf of the Cochrane
Statistical Methods Group and the Cochrane Bias Methods Group
8.1 Introduction 188
8.2 What is bias? 188
8.3 Tools for assessing quality and risk of bias 190
8.4 Introduction to sources of bias in clinical trials 193
8.5 The Cochrane Collaboration’s tool for assessing risk of bias 194
8.6 Presentation of assessments of risk of bias 202
8.7 Summary assessments of risk of bias 202
8.8 Incorporating assessments into analyses 206
8.9 Sequence generation 210
8.10 Allocation sequence concealment 214
8.11 Blinding of participants, personnel and outcome assessors 217
8.12 Incomplete outcome data 219
8.13 Selective outcome reporting 226
8.14 Other potential threats to validity 230
8.15 Chapter information 234
8.16 References 235
9 Analysing data and undertaking meta-analyses 243
Edited by Jonathan J Deeks, Julian PT Higgins and Douglas G Altman on behalf
of the Cochrane Statistical Methods Group
9.1 Introduction 244
9.2 Types of data and effect measures 249
9.3 Study designs and identifying the unit of analysis 260
9.4 Summarizing effects across studies 263
9.5 Heterogeneity 276
9.6 Investigating heterogeneity 282
9.7 Sensitivity analyses 289
9.8 Chapter information 292
9.9 References 293
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10 Addressing reporting biases 297
Edited by Jonathan AC Sterne, Matthias Egger and David Moher on behalf
of the Cochrane Bias Methods Group
10.1 Introduction 298
10.2 Types of reporting biases and the supporting evidence 299
10.3 Avoiding reporting biases 308
10.4 Detecting reporting biases 310
10.5 Chapter information 324
10.6 References 325
11 Presenting results and ‘Summary of findings’ tables 335
Holger J Schu¨nemann, Andrew D Oxman, Julian PT Higgins, Gunn E Vist, Paul
Glasziou and Gordon H Guyatt on behalf of the Cochrane Applicability and
Recommendations Methods Group and the Cochrane Statistical Methods Group
11.1 Introduction 335
11.2 ‘Characteristics of included studies’ tables 336
11.3 Data and analyses 337
11.4 Figures 341
11.5 ‘Summary of findings’ tables 342
11.6 Additional tables 350
11.7 Presenting results in the text 351
11.8 Writing an abstract 352
11.9 Writing a plain language summary 355
11.10 Chapter information 356
11.11 References 357
12 Interpreting results and drawing conclusions 359
Holger J Schu¨nemann, Andrew D Oxman, Gunn E Vist, Julian PT Higgins,
Jonathan J Deeks, Paul Glasziou and Gordon H Guyatt on behalf of the
Cochrane Applicability and Recommendations Methods Group
12.1 Introduction 360
12.2 Assessing the quality of a body of evidence 361
12.3 Issues in applicability 367
12.4 Interpreting results of statistical analyses 369
12.5 Interpreting results from dichotomous outcomes (including numbers needed
to treat) 372
12.6 Interpreting results from continuous outcomes (including standardized mean
differences) 377
12.7 Drawing conclusions 380
12.8 Chapter information 382
12.9 References 383
Part 3 SPECIAL TOPICS 389
13 Including non-randomized studies 391
Barnaby C Reeves, Jonathan J Deeks, Julian PT Higgins and George A Wells on
behalf of the Cochrane Non-Randomised Studies Methods Group
13.1 Introduction 392
13.2 Developing criteria for including non-randomized studies 396
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13.3 Searching for non-randomized studies 404
13.4 Selecting studies and collecting data 407
13.5 Assessing risk of bias in non-randomized studies 412
13.6 Synthesis of data from non-randomized studies 419
13.7 Interpretation and discussion 424
13.8 Chapter information 428
13.9 References 429
14 Adverse effects 433
Yoon K Loke, Deirdre Price and Andrew Herxheimer on behalf of the Cochrane
Adverse Effects Methods Group
14.1 Introduction 433
14.2 Scope of a review addressing adverse effects 434
14.3 Choosing which adverse effects to include 437
14.4 Types of studies 438
14.5 Search methods for adverse effects 439
14.6 Assessing risk of bias for adverse effects 442
14.7 Chapter information 445
14.8 References 446
15 Incorporating economics evidence 449
Ian Shemilt, Miranda Mugford, Sarah Byford, Michael Drummond, Eric Eisenstein,
Martin Knapp, Jacqueline Mallender, David McDaid, Luke Vale and Damian
Walker on behalf of the Campbell and Cochrane Economics Methods Group
15.1 The role and relevance of economics evidence in Cochrane reviews 449
15.2 Planning the economics component of a Cochrane review 454
15.3 Locating studies 459
15.4 Selecting studies and collecting data 462
15.5 Addressing risk of bias 463
15.6 Analysing and presenting results 468
15.7 Addressing reporting biases 472
15.8 Interpreting results 474
15.9 Conclusions 474
15.10 Chapter information 476
15.11 References 476
16 Special topics in statistics 481
Edited by Julian PT Higgins, Jonathan J Deeks and Douglas G Altman on behalf
of the Cochrane Statistical Methods Group
16.1 Missing data 482
16.2 Intention-to-treat issues 488
16.3 Cluster-randomized trials 493
16.4 Cross-over trials 498
16.5 Studies with more than two intervention groups 508
16.6 Indirect comparisons and multiple-treatments meta-analysis 513
16.7 Multiplicity and the play of chance 516
16.8 Bayesian and hierarchical approaches to meta-analysis 518
16.9 Rare events (including zero frequencies) 520
16.10 Chapter information 524
16.11 References 524
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17 Patient-reported outcomes 531
Donald L Patrick, Gordon H Guyatt and Catherine Acquadro on behalf of the
Cochrane Patient Reported Outcomes Methods Group
17.1 What are patient-reported outcomes? 532
17.2 Patient-reported outcomes and Cochrane reviews 533
17.3 Health status and quality of life as PRO outcomes 534
17.4 Issues in the measurement of patient-reported outcomes 537
17.5 Locating and selecting studies with patient-reported outcomes 538
17.6 Assessing and describing patient-reported outcomes 539
17.7 Comparability of different patient-reported outcome measures 540
17.8 Interpreting results 541
17.9 Chapter information 543
17.10 References 544
18 Reviews of individual patient data 547
Lesley A Stewart, Jayne F Tierney and Mike Clarke on behalf of the Cochrane
Individual Patient Data Meta-analysis Methods Group
18.1 Introduction 548
18.2 The collaborative nature of IPD meta-analyses 550
18.3 Dealing with data 551
18.4 Analysis 553
18.5 Limitations and caveats 555
18.6 Chapter information 556
18.7 References 557
19 Prospective meta-analysis 559
Davina Ghersi, Jesse Berlin and Lisa Askie on behalf of the Cochrane Prospective
Meta-analysis Methods Group
19.1 Introduction 559
19.2 The collaborative nature of prospective meta-analyses 562
19.3 The prospective meta-analysis protocol 563
19.4 Data collection in prospective meta-analysis 566
19.5 Analysis issues in prospective meta-analysis 567
19.6 Chapter information 569
19.7 References 569
20 Qualitative research and Cochrane reviews 571
Jane Noyes, Jennie Popay, Alan Pearson, Karin Hannes and Andrew Booth
on behalf of the Cochrane Qualitative Research Methods Group
20.1 Introduction 572
20.2 Incorporating evidence from qualitative research in Cochrane Intervention
reviews: concepts and issues 572
20.3 Qualitative evidence synthesis 576
20.4 Chapter information 583
20.5 References 584
20.6 Further selected reading 587
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21 Reviews in public health and health promotion 593
Edited by Rebecca Armstrong, Elizabeth Waters and Jodie Doyle
21.1 Introduction 593
21.2 Study designs to include 594
21.3 Searching 594
21.4 Assessment of study quality and risk of bias 595
21.5 Ethics and inequalities 597
21.6 Context 599
21.7 Sustainability 600
21.8 Applicability and transferability 601
21.9 Chapter information 603
21.10 References 603
22 Overviews of reviews 607
Lorne A Becker and Andrew D Oxman
22.1 Introduction 607
22.2 Preparing a Cochrane Overview of reviews 608
22.3 Format of a Cochrane Overview 613
22.4 Chapter information 631
22.5 References 631
Index 633
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Index
absolute risk reduction (ARR) see risk
difference
abstracts 55, 352–5
adverse effects 441–2
non-randomized studies 406
Overviews of reviews 615–16
searching 98, 110, 143, 145, 406, 441–2
selecting studies 153
accumulation of changes 38
acknowledgements 68, 624
ACR see assumed control risks
Additional tables 72, 234, 350–1, 468, 539
adherence 160, 369
adverse effects 433–48
data collection 161–2
definitions 434
drop-outs 438
eligibility criteria 434–8
narrow/broad focus 437–8
non-randomized studies 397, 400, 427, 438,
443–5
review questions 90
risk of bias/quality 442–5
searching 439–42
separate reviews 436–7
sources of information 439–40
strategies for addressing 434–7
Summary of findings tables 348–9
types of studies 438, 442–5
Adverse Effects Methods Group (AEMG) 446
advisory groups 19–20
AEMG see Adverse Effects Methods Group
aetiological research questions 399
agreement measures 155–6, 169
allied health-specific databases 103–4
allocation concealment 193, 211, 214–17
results sections 65
Risk of bias tool 196, 198–9, 203–4
amendments 33, 34–7
analysing data see meta-analysis
analysis of covariance (ANCOVA) 270
analysis plans 58, 60–3, 244–6, 564, 565
prospective meta-analyses 564, 565
ANCOVA see analysis of covariance
appendices 78
search strategies 144, 146
applicability
discussion sections 66
interpreting results 367–9
Overviews of reviews 622–3
public health and health promotion 601–3
Applicability and Recommendations Methods
Group (ARMG) 383
ARR (absolute risk reduction) see risk
difference
as-treated analyses 225
assessing a review as up to date 40, 43–4, 54,
625–6
assumed control risks (ACR) 347, 349, 374,
376–7
attrition bias 194–6, 200, 219
authors’ conclusions see conclusions
authorship 36, 38, 39, 52–3
available case analysis 489, 490, 492
background sections 56–7, 617–18
baseline imbalance 231–2
baseline risk see control group risk
Bayesian methods 210, 518–19
before-and-after studies 393, 596–7
bias see publication bias; reporting bias; risk
of bias
Bias Methods Group (BMG) 324
bibliographic databases 98–107
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binary outcome data see dichotomous outcome
data
biologic variation 368
biology-specific databases 103
blinding 193–4, 217–9
results sections 65
review authors 168, 192, 382
Risk of bias tool 195–196, 199, 203–4,
217–19
blocked randomization 194, 212, 232
BMG see Bias Methods Group
Boolean operators 132–3, 141
broad questions 91–3
Campbell and Cochrane Economics Methods
Group (CCEMG) 454, 463, 468, 475,
543
Campbell Collaboration 147
Campbell Coordinating Groups 584
Campbell Equity Methods Group 597–8
carry-over effects 499–503
case reports 438, 444–5
case series 393, 438
case-control studies 393, 399, 415–16, 438,
443–4
CBA see cost-benefit analysis
CBT see cognitive behavioural therapy
CCEMG see Campbell and Cochrane
Economics Methods Group
CCTs see controlled clinical trials
CDSR see Cochrane Database of Systematic
Reviews
CEA see cost-effectiveness analysis
CENTRAL see Cochrane Central Register of
Controlled Trials
central randomization 216
Centre for Reviews and Dissemination (CRD)
111, 460–2, 463
CGR see control group risk
change scores 172, 269–70
standard deviations 485–8
changing review questions 93
Characteristics of studies tables 63–4, 70–2
economics evidence 468
excluded studies 64, 71, 154
included studies 63–4, 70, 336–7, 468
ongoing studies 64, 72
Overviews of reviews 620, 625–6
studies awaiting classification 64, 71
checklists 191
chi-squared tests 277–8, 281, 284, 338–9
CINAHL database 103, 579
citation
bias 298, 306
indexes 105
versions 33–6, 37–9, 55
citing
protocols 58
reviews 25–6
clinical event pathways 455–6
clinical trials see randomized trials
cluster-allocated studies 409–11
see also cluster-randomized trials
clustering 498
cluster-randomized trials 260, 493–8
effective sample sizes 495–7
inflating standard errors 497
meta-analysis 495–6, 497
methods of analysis 495
public health and health promotion 594, 595,
599
risk of bias 494–5
sensitivity analyses 291
CMR see Cochrane Methodology Register
Cochrane, Archie 4, 450
Cochrane Central Register of Controlled Trials
(CENTRAL) 5, 98–100, 108, 118–29,
133, 139–42, 406
Cochrane Collaboration 3–6
maintenance of Cochrane reviews 32
preparation of Cochrane reviews 11, 18, 24–8
principles 4, 8
publication of Cochrane reviews 5–6
structure 4–5
Cochrane Database of Systematic Reviews
(CDSR) 5–6
citation versions 33–6
citing 25–6
dates 40, 54–5
Overviews of reviews 608
prospective meta-analyses 566
protocols 12–13, 17
searching see Cochrane Library
withdrawn reviews 46
Cochrane Health Equity Field 597–8
Cochrane Library 5
Cochrane Review Groups 22–4
economics evidence 460–1
feedback 48
Overviews of reviews 608
searching 99–100, 119, 121, 124–6, 133–4
Cochrane Methodology Register (CMR) 5
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INDEX 635
Cochrane Review Groups (CRGs) 4–5, 7
economics evidence 453–4
guidance and support 17, 20–4, 27, 59, 68, 91
maintenance of Cochrane reviews 32, 35,
37–8, 41, 45–6, 48
non-randomized studies 398, 399–400, 403,
406–7
Overviews of reviews 607–8, 613
plain language summaries 355–6
prospective meta-analyses 566
public health and health promotion 595
qualitative research 576, 583–4
searching 59–60, 96–8, 102, 108, 118–19,
123–5, 130, 144
statisticians 292
Cochrane reviews
Diagnostic test accuracy 7, 20
Intervention 6–7, 12–16
Methodology 20
Overviews of reviews 20, 607–31
coding schemes 167
cognitive behavioural therapy (CBT) 536
cohort studies 393, 399, 415, 438, 443–4
collaborations
individual patient data 549, 550–1
prospective meta-analyses 562–3
see also Cochrane Collaboration
combining studies see meta-analysis
combining subgroups/intervention groups 177
comments and criticisms see feedback
commercial interests 26–8, 303–4, 624
community healthcare-specific databases 104
comparisons 74–5, 86–7, 245, 247–8
completeness of evidence 66
concealment of allocation see allocation
concealment
conclusions 67, 380–2
abstract 353, 355
changed 34, 37–8
economics evidence 474
Overviews of reviews 616, 623–4
qualitative research 578
conditional outcomes 492–3
conference abstracts/proceedings 110–11
confidence intervals 369–71
continuous outcome data 172–5, 370
data extraction 173–5, 181–2
dichotomous outcome data 171, 370
forest plots 338
rare events 522
Summary of findings tables 349–50
confidentiality 550–1, 563
conflicts of interest see declarations of interest
confounding
GRADE/quality of evidence 362, 366
heterogeneity 287
indirect comparisons 514
non-randomized studies 395, 397, 412,
416–17, 420–2, 425–6
public health and health promotion 594
consensus 169
consistency see heterogeneity
consumer involvement 18–19
contact persons 53–4
contents of Cochrane reviews 12–16, 51–79
abstracts 55
appendices 78
data and analyses 74–5
feedback 77
figures 76–7
plain language summaries 55
protocol information 52–5
review information 52–5
studies and references 72–4
tables 70–2
text 55–70
titles 52–3
context 368–9, 599–600
continuous outcome data 250, 255–7
confidence intervals 172–5, 370
counts 179
data extraction 171–7, 179
forest plots 338–9
funnel plots 317–18
individual patient data 554, 555
intention to treat 491–2
interpreting results 377–9
meta-analysis 268–72, 290
non-randomized studies 421
Overviews of reviews 629
results sections 338–9, 349, 370, 377–9
risk of bias 200, 223–4, 227
Summary of findings tables 349
see also patient-reported outcomes
contour-enhanced funnel plots 313–15
contributions of authors 68–9
control group risk (CGR)
effect measures 251–3
interpreting results 346–7, 349, 374,
377
meta-regression 288–9
see also assumed control risk
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636 INDEX
controlled
before-and-after studies 393
vocabulary 130–1, 440, 538–9
controlled clinical trial (CCT) 119–23, 126
copyright 97–8
correlation coefficients 486–8, 496–8, 505–7
correspondence with investigators 163, 166, 193
cost data 470–1
cost-benefit a
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