Chapter 4 Literature Review

Transcript Chapter 4 Literature Review

Chapter 6 Understanding the Literature Review in Published Studies

What Is a Literature Review?

  Summary of current empirical and theoretical knowledge about particular practice problem that provides a basis for the study conducted Includes:  Description of current knowledge base   Gaps in knowledge base Contribution of present study to knowledge base Copyright © 2011 by Saunders, an imprint of Elsevier Inc.

Sources Included in a Literature Review

      Theoretical literature: concept analyses, theories, and models that support research purpose Empirical literature: relevant studies Citation: a source quoted by the author Periodical: a journal Monograph: a book or published conference proceedings Thesis and dissertation: research by master’s and doctoral degree students Copyright © 2011 by Saunders, an imprint of Elsevier Inc.

Types of Sources

  Primary sources are written by the person who generated the published ideas.   In research, written by the person(s) who conducted the research In theory, written by the theorist(s) who developed the theory Secondary sources paraphrase the works of researchers and theorists.

Purposes of Literature Review in Quantitative Studies

    Direct the development and implementation of a study Cite relevant and current sources Document background and significance of study Identify theoretical ideas guiding the building of a body of knowledge for the selected area of study Copyright © 2011 by Saunders, an imprint of Elsevier Inc.

Purpose of Literature Review in Qualitative Studies (cont’d)

 Provides a basic understanding of the study problem and evidence that the study conducted was appropriate, based on current knowledge of the problem Copyright © 2011 by Saunders, an imprint of Elsevier Inc.

Qualitative Research Methods and the Literature Review

    Phenomenological Grounded theory Ethnographic Historical     Compare and combine study findings with literature Use literature to explain, support, and extend research theory Literature provides background for research Literature develops research questions and is source of data Copyright © 2011 by Saunders, an imprint of Elsevier Inc.

Guidelines for Literature Review

    Includes what is known and not known about the topic Includes the focus of the study Sources must be current —published within the past 5 years Landmark studies may be included if essential to the background of the problem Copyright © 2011 by Saunders, an imprint of Elsevier Inc.

Questions Guiding Critique of Literature Review

      Are primary sources cited in the review?

Are the references current?

Are relevant studies identified and described?

Are relevant theories identified and described?

Are relevant landmark studies described?

Are the studies critiqued?

Questions Guiding Critique of Literature Review (cont’d)

    Are sources paraphrased to promote the flow of content?

Is the current knowledge about the research problem described?

Does literature review identify gap(s) in knowledge base that provides basis for study?

Is the literature review clearly organized, logically developed, and concise?

Library Sources

     Academic libraries —colleges and universities Special libraries —hospitals, Sigma Theta Tau Center for Nursing Scholarship Interlibrary loan Online search Public libraries Copyright © 2011 by Saunders, an imprint of Elsevier Inc.

Selecting Databases

   Bibliographic database: compilation of citations  Citation: provides information necessary to locate a reference Full-text database: provides the entire text of articles for your use Commonly used databases in nursing  CINAHL, Medline, OVID, EBSCOhost, GALE Cengage, and Cambridge Scientific Copyright © 2011 by Saunders, an imprint of Elsevier Inc.

Keywords

    Major concepts or variables of a research problem or topic used to search a database May be single terms or phrase Most databases have a thesaurus that can be used to identify keywords.

Each keyword used should be listed in a written search plan.

Recording Search Information

      Name of database Date of search Exact search strategy used Number of articles found Percentage of relevant articles found This information can be stored in a table.

Performing Complex Searches

  Complex searches combine two or more concepts, synonyms, or keywords in one search using “and.” Select keywords you have used to perform simple searches.

Limiting a Search

  Some searches will result in thousands of hits.

To reduce number of hits while increasing the relevance of citations, limit:  To English language    The publication dates to recent years To papers that are research To full-text articles (this can be risky) Copyright © 2011 by Saunders, an imprint of Elsevier Inc.

Search Fields

   Search fields are the various pieces of information provided about an article by the bibliographical database.

To select search fields in CINAHL, select the Search Fields option at top of the search page.

Of particular importance, selecting “cited reference” will give you full references of all citations included in each article. You may find “treasures” not included in the computer search. Copyright © 2011 by Saunders, an imprint of Elsevier Inc.

Electronic Nursing Journals

    An increasing number of nursing journals publish only in electronic form.

Expensive to publish and distribute a printed journal Electronic journals targeted to small specialty audiences These journals have more current information because articles are published within 3 to 4 months of submission, whereas the time from submission to publication in traditional journals is 1 to 2 years.

Searching for Electronic Journals

    Because they are new, many electronic journals are not yet in bibliographic databases.

Ingenta (www.ingenta.com) is a commercial web site to search online journals from many disciplines.

A list of current electronic nursing journal web sites is available in your text.

You may locate the electronic journal on the Internet and then scan the titles of articles published in the journal.

Searching the Internet

    Search engines provide the means to search the Internet.

Some are better than others. Google Scholar is an excellent search engine.

University libraries provide a list of good search engines.

You may find information on the Internet that is useful to your topic.

Assessing Web-Based Information

    Advantage: information is more current than that found in books Disadvantage: information is uneven in terms of accuracy There is no screening process for information put on the Web.

It is important to check the source of any information obtained on the Web to judge its validity.

Saving Search Results

  Save the results of each search on:   Computer hard drive Floppy disk   Zip file CD Record the file name of saved search results on the search record.

Clarifying Evidence for Best Practice through Literature Reviews

    Literature reviews can be used to define the state of the science in a given area of practice.

When results are published, these reviews are referred to as

integrative reviews

of literature.

The purpose is to identify, analyze, and synthesize results from independent studies to determine current knowledge in particular area.

Development of Protocol or Critical Pathway

   Integrative reviews are used to develop protocols and critical pathways.

This process is often used by nursing committees in health care facilities. Studies are selected for inclusion based on their quality and relationship to selected practice problems.

Synthesis of Sources

Sources of Integrated Reviews

    

Annual Review of Nursing Research

Journal:

Evidence-Based Nursing Sigma Theta Tau Online Journal of Nursing Synthesis

Meta-analyses

Meta analyses (cont’d)

  Provide a global estimate of such things as mean number of days of hospitalization following particular procedure, or reduction in number of hours in a care unit from a particular nursing intervention Results of meta-analyses are sometimes referred to as

benchmarking.

Writing a Review of Literature

  Purposes   Document current knowledge of selected topic Indicate findings ready for use in practice Outline    Introduction Empirical literature Summary Copyright © 2011 by Saunders, an imprint of Elsevier Inc.

1. Introduction

   Indicates focus or purpose of review Describes organization of sources Indicates basis for ordering:    Most important to least Earliest to most recent Categories Copyright © 2011 by Saunders, an imprint of Elsevier Inc.

2. Data-Based Literature

   Includes quality studies relevant to topic For each study, purpose, sample, sample size, design, and specific findings are presented, using paraphrasing rather than direct quotes.

Ethical Issues in Empirical Literature

  Content from studies must be presented honestly and not distorted to support selected use project.

Weaknesses of study need to be addressed, but it is not necessary to be highly critical of a researcher’s work.

Ethical Issues in Empirical Literature (cont’d)

  Criticism should focus on content, be related to your project, and be neutral and scholarly rather than negative and blaming.

Sources should be accurately documented.

3. Summary

   Concise presentation of research knowledge about selected topic —what is known and not known Judgment stating whether there is adequate knowledge to direct change in clinical practice Brief statement of proposed change in practice Copyright © 2011 by Saunders, an imprint of Elsevier Inc.