summerschool 2013 umcg pediatrics & neuroscience
TRANSCRIPT
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PubMed & Impact Factors
Summerschools 2013 Pediatrics & NeuroScience UMCG
Central Medical Library July 9th 2013
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Your teachers this afternoon
Guus van den Brekel & Hans Froon
Email: [email protected]
Website library: http://www.rug.nl/umcg/library
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Content
1. Finding Best Evidence and PubMed• Excercises• feedback
2. Impact Factors, H-Index, Top 25% ..• Excercises• feedback
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Finding best evidence & PubMed
PICO approach & ExamplesPubMed Tutorials:
From NLM: http://www.nlm.nih.gov/bsd/disted/pubmed.html•Intro (What is PubMed), •term mapping, •Boolean operators, •MeSH, •textwords, •filters
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PICO(S)
P : Patient or problem
I : Intervention (or risk factor, prognostic factor)
C : Control group (or absence of risk factor, progn.factor)
O : Outcome
(S): Study type
Categories: therapy, diagnosis, etiology, prognosis
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Example 1
A 30 year old man attends the
emergency department after having
been bitten by a dog 4 hours
previously. He has puncture wounds
and a 1 cm laceration on his forearm.
His wounds are thoroughly cleaned and
a dressing has been applied.
Question: Do you need to prescribe
antibiotics?
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PICO(S) example 1:
P = (adults with) dog bites
I = antibiotics
C = no antibiotics/ placebo
O = incidence of wound infection
S = randomized controlled trial
•Find search terms and synomyms for every section when needed
•Build your search strategy with Boolean operators
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PICO(S) example 1:
T
• Dog bite antibiotics
• (dog OR dogs) AND (bite OR bites) AND (antibiotic OR antibiotics OR penicillin)
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Boolean Operators (AND, OR, NOT)
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Example 2
An 5 year-old child has crashed on his bicycle into a
car.
He suffers from abdominal pain, caused by his bike’s
handlebar which thumped into his abdomen.
Question: What is the value of a CT-scan compared
to echography in case of a child with blunt (non-
penetrating) abdominal trauma?
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PICO(S) example 2
P = child blunt abdominal trauma
I = CT
C = echography
O = (diagnostic value)
(S) = (diagnostische studies)
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Exercises Finding Best Evidence
1. You are interested in the effectivity of interventions (such as cognitive therapy) aimed at the prevention of major depression recurrence/relapse. P = I = C = O = Type of article:
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Exercises Finding Best Evidence
2.For adolescents with OCD (obsessive comp. Disorder), which treatment is more effective to start with: cognitive behaviour therapy, an anti-depressive agent (SSRI) or a combination of both treatments? P = I = C = O = Type of article:
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Exercises Finding Best Evidence
3. Many babies that are breastfed sleep regularly part of the night in the bed of their parents. Since a couple of years this is strongly discouraged in guidelines to prevent cot death (Sudden Infant Death Syndrome). Can you find evidence that sleeping between the parents is a risk factor for SIDS?P = I = C = O = Type of article:
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Feedback & Questions
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Top 25%, Impact Factors and h-index
List top 25% journals per ISI category http://atumcg.cmb.med.rug.nl
CMB-website: www.rug.nl/umcg/library
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Impact Factor
Measure for number of citations to a journal over a certain period of time
Quality?
1975- now : Journal Citation Reports
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MOLECULAR IMMUNOLOGY
Cites in 2008 to articles from 2007 resp 2006: 1143 + 800 = 2243 cites
Number of articles in 2007 resp 2006: 407 + 224 = 631
Impact Factor: 2243/ 631 = 3.555
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Value
Depends on ISI “Subject Category” view journal summary list
Top 25%
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MOLECULAR IMMUNOLOGY
1st Category: BIOCHEMISTRY & MOLECULAR BIOLOGY
Ranking based on impact: 89 / 275 = 0.32 (history)
2012 Ranking: 161 / 290 = 0.55
Outside top 25%
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MOLECULAR IMMUNOLOGY
2nd Category: IMMUNOLOGY
Ranking based on impact: 35 / 121 = 0.29 (history)• 2012 Ranking: 81 / 135 = 0.60
Also outside top 25%!
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Positive
broad spectrum (9000 journals, 60 countries)
objective (quantity) worldwide known
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negative
limited to ISI journals
subject category dependentComparing IFsDisadvantage specific research area
influence of “spikes”
Manipulation
IF does not say anything about individual article
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Other measures of impact
Journal Immediacy Index (ISI)
Journal Cited Half-Life/ Journal Citing Half-Life
EigenFactor & Article Inluence Score (ISI) www.eigenfactor.org
SCImago Journal & Country Rank (Scopus) www.scimagojr.com
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Output scientists
bookchapters, thesis patents conference proceedings articles in peer-reviewed journals
number of publicaties (in top 25%)
citations, citaties per article
Hirsch-index
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Impact authors: citation analysis
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Citation analyse
the number of publications the number of publications in top 25% (in relevant ISI-subject categories) the number of citations h-index …
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Databases
Peer reviewed literature:
Web of Science (SCI + SSCI)– Thomson ISI (Scopus - Elsevier) Medline - NLM Embase - Elsevier
coverage>99.9%
Other:
Repository RUG: thesis researchers /PiCarta: book chapters
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Databases for citation analysis
Web of Science– Thomson ISI
Scopus – Elsevier (no access anymore)
Access via CMB website: http://www.rug.nl/umcg/libraryAccess to full text & databases from home:Use your S-number or guest account
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prof. dr. D.S. Postma
Web of Science (author search)
Postma DS: 587 hitsExcluded: meeting abstracts, notes, corrections
511 hits (=articles, reviews, editorials, letters, proceeding papers)
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prof. dr. D.S. Postma
Web of Science (advanced search)
#1 (AU=Postma DS) AND (OG=gron* OR OG=beatr*) 529 hits#2 AU=Postma D AND TS=(immu* OR asthma* OR lung* OR resp* OR pulm*) AND (OG=gron* OR OG=beatr*) 23 hits#3 (#1 OR #2) 552 hits
Excluded: meeting abstracts, notes, corrections
480 hits (=articles, reviews, editorials, letters, proceeding papers)
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Difficult author names
Multiple initials“Tussenvoegsels”, insertionName changes (marriage)Common names
Voorbeeld: prof. P.E. de Jong de Jong PE; Dejong PE; Jong PED; de Jong P
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H-index
J.E. Hirsch (2005)
H-index = n:author has n publications with n citations or more
Power: less influence spikes
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Publishing a lot is not rewarded, but the publishing of
many higly-cited publications is!
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Other interesting links
• Google Scholar http://Scholar.google.com
• Publish or Perish (PoP): http://www.harzing.com/pop.htm
• AltMetrics : alternative metrics for impact: http://altmetrics.org/manifesto/
• 10 Ways to calculate your H-Index : free and otherwisehttp://digicmb.blogspot.nl/2013/06/ways-to-calculate-your-h-index-free-and.html
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Excercises
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Exercise 1: Impact Factor
You are working on a systematic review on the prevention of obesity in young children. You consider to send your your manuscript to the Int J Pediatr Obes.
•What is the impact factor? •Is it top25%? •What are the ISI fields of this journal? •What would be a good alternative (journal)?
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Published papers by Simone Times Cites
paper 1 (2012) 0
Paper 2 (2012) 1
Paper 3 (2011) 3
Paper 4 (2010) 5
Paper 5 (2010) 1
Paper 6 (2010) 0
Paper 7 (2009) 15
Paper 8 (2008) 3
Exercise 2: h-indexA young researcher, Simone, has 8 publications. One of her papers, a review, has been cited 15 times. The sum of the times cited is 28. What is the h-index of Simone?
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Exercise 3: publication and citation overview
Prof. D. Postma is a respected researcher at the department of Pulmonology. Her initials are DS (Dirkje S. Postma).
•How many publications of prof. Postma (in combination with the address field – Groningen) are found in WOS/WOK? •What is the corresponding h-index?
Compare this to the number of publications in Scholar Google.
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Feedback & Questions
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A little extra!
Make life easier!
Use Journal Apps to keep up with the literature.
BrowZine | Docwise | Read by QxMD
Read more: http://libguides.rug.nl/medicalEjournals