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Bibliometric analysis of scientific publications on waterpipe (narghile, shisha, hookah) tobacco smoking during the period 2003-2012

Tobacco Induced Diseases volume 12, Article number: 7 (2014) Cite this article

Abstract

Background

Waterpipe tobacco smoking has spread worldwide. However, the evaluation of scientific output in the field of waterpipe tobacco smoking has not been studied yet. The main objectives of this study were to analyze worldwide research output in the waterpipe tobacco smoking field, and to examine the authorship pattern and the citations retrieved from the Scopus database for over a decade.

Methods

Data from January 1, 2003 through December 31, 2012 were searched for documents with specific words regarding waterpipe tobacco smoking as “keywords” in the title. Scientific output was evaluated based on a methodology developed and used in other bibliometric studies: (a) total and trends of contributions in waterpipe tobacco smoking research between 2003 and 2012; (b) authorship patterns and research productivity; (c) collaboration patterns; (d) the citations received by the publications; and (e) areas of interest of the published papers.

Results

Worldwide there were 334 publications that met the criteria during the study period. The largest number of publications in waterpipe tobacco smoking were from the United States of America (USA) (33.5%), followed by Lebanon (15.3%), and France (10.5%). The total number of citations at the time of data analysis (October 18, 2013) was 4,352, with an average of 13 citations per document and a median (interquartile range) of 4.0 (1.0–16.0). The h-index of the retrieved documents was 34. The highest h-index by country was 27 for the USA, followed by 20 for Syrian Arab Republic and Lebanon.

Conclusions

The present data reveal a promising rise and a good start for research activity in the field of waterpipe tobacco smoking. More effort is needed to bridge the gap in waterpipe smoking-based research and to promote better evaluation of waterpipe smoking, risks, health effects, or control services worldwide.

Background

Tobacco use is the most important single risk factor for both heart diseases and cancer and is also the most preventable leading cause of morbidity and mortality, annually contributing to around 6 million deaths worldwide, and is estimated to exceed 8 million deaths by 2030[1]. Unfortunately, scientific research tends to focus on tobacco use methods that are widespread in developed countries (e.g., cigarettes, tobacco cessation) and often does not consider methods prevalent in developing countries, such as the waterpipe[2, 3]. The waterpipe, known in many cultures under different names (e.g., narghile, shisha, hookah), is a centuries-old tobacco-use method that has traditionally been associated with Middle Eastern societies. In fact, waterpipes are now commonplace in Arab cultures, and are served in many cafes and restaurants in the Eastern Mediterranean Region (EMR). In the waterpipe, inhalation of charcoal-heated air is done through perforated aluminium foil separating the charcoal from the flavoured tobacco to become smoke; this smoke is sweetened and flavoured (for example, apple, watermelon, mint)[3, 4]. Other forms of tobacco may contain less sweeteners/flavours and are called Ajami, or Tumba’k. Smoke travels down the body of pipe, and bubbles through water in the bowl to cool on its way to smokers’ lungs[3, 5]. The emergence of waterpipe smoking as a global risk to public health is evidenced by the promising increase in the past decade of studies devoted to the waterpipe[2, 4, 6–10].

Tobacco smoking is on the rise and as a multi-disciplinary field of study, has resulted in growing research that takes into account almost all the regions that have experienced the greatest increases in bioscience and healthcare science production[11, 12]. In contrast, the evolution of the overall output of scientific research in the field of tobacco use has been poorly explored to date and there are few internationally published reports on research activity regarding tobacco use[13–17].

The evaluation of scientific research in a certain field is an essential task where the purpose of evaluation is to determine, and where possible to improve, productivity. Scientific progress is one of the most important indicators of community and economic development of different countries[18]. Bibliometric analysis is a useful tool to obtain a clear picture of the current state of scientific research in particular areas and allocates researchers to recognise and undertake new lines of research[19]. This type of analysis is a type of research method used in library and information sciences. It utilises quantitative analysis and statistics to obtain the bibliographical works within a given field, topic, institute, or country[20, 21]. The most important key indicators of research capacity and productivity in the field of tobacco include the number of peer-reviewed scientific journal articles, numbers of total citations, and type of publications[16, 22].

The objectives of this study were to analyze worldwide research output in the waterpipe tobacco smoking field, and the citations retrieved from the Scopus database between 2012-2013.

Methods

Search strategy

This study relied on data extracted from Scopus that was published between January 1, 2003 and December 31, 2012. The choice of the study duration was based on the assumption that the last decade represents a better picture of the pattern of publications and citations received in a certain field when using bibliometric methods[23–26]. A comprehensive online search was performed using SciVerse, Scopus, which is one of the world’s largest databases of peer-reviewed literature. Scopus covers nearly 18,000 titles from 5,000 publishers worldwide, and contains 41 million records and provides 100% MEDLINE coverage[27].

Waterpipe terminology can depend upon region, and includes names such as “shisha” (Egypt, Saudi Arabia), “narghile” “nargile,” or “arghile” (Israel, Jordan, Lebanon, Syria), and “hookah” or “hubble bubble” (Africa and India)[3]. The keywords entered into the Scopus engine to achieve the objectives of this study were selected from the related studies on waterpipe usage[2, 3, 28, 29]. All the following selected “keywords” were entered as “Article Title”: “waterpipe,” “sheesha,” “hookah,” “hukka,” “narghile,” “shisha,” “hubble bubble,” “hubbly-bubbly,” “qalyan,” “ghelyan,” “nargile,” “nargila,” “water pipe,” and “water-pipe.” Most of the time the term “water pipe” is used as a pipe for conveying water. Then, to avoid this confusion, the following keywords: “smoking,” “tobacco,” “smoke,” “smoker,” “nicotine,” smokeless,” non-smoking,” and “secondhand” were entered as “all fields.” All subject areas for a 10-year period (2003-2012) were selected for this research: health sciences, social sciences, life sciences, and physical sciences. We excluded documents that published as errata or as a chapter in a book. We also excluded those documents in which the primary focus was not a dimension of waterpipe tobacco smoking.

The collected data were used to generate the following information: (a) total and trends of contributions in waterpipe tobacco smoking research between 2003 and 2012; (b) authorship patterns and research productivity; (c) collaboration patterns; (d) the citations received by the publications; and (e) areas of interest of the published papers. All searches were completed within one day on October 18, 2013 to avoid bias due to the daily update of databases.

Ethical approval

The Institutional Review Board (IRB) at An-Najah National University does not require submission of an IRB application for such study. Previous similar publications by the same group of authors were officially waived from submission of an IRB application[30]. The IRB considered that there is no risk for human subjects in such publications since the data are based on published literature rather than human subjects and did not involve any interactions with human subjects.

Statistical analysis

Data from Scopus were exported to Microsoft Office Excel® and then transferred to the Statistical Package for Social Sciences (SPSS; SPSS Inc., Chicago, IL, USA) program version 15 for analysis. Variables that are not normally distributed are expressed as median (Q1–Q3: interquartile range) and categorical data are expressed as numbers with percentages. The h-index for the data collected from Scopus is presented. The h-index represents the number of citations received for each of the documents in descending order, while the h-graph measures the impact of a set of documents and displays the number of citations per document. Impact factors (IF) for the journals were evaluated using the Journal Citation Report (JCR; Web of Knowledge) 2012 science edition by Thomson Reuters (New York, NY, USA).

Results

The total number of documents published globally about waterpipe tobacco smoking from 1976 until 2012 was 353 while that between 2003 – 2012 was 334. This means that 94.6% of the total global research productivity in waterpipe tobacco smoking was published during the specified study period. Analysis in this manuscript was based on the 334 documents since it represents approximately 95% of the global research in the field of waterpipe smoking in the past 3 decades. The 334 documents consisted of 219 (65.6%) original journal articles, 53 (15.9%) letters to the editor, 33 (9.9%) review articles, and 29 (8.7%) other types of publications, with an average of 33 documents per year. The annual number of documents published in the past decade (2003–2012) indicate that waterpipe tobacco smoking research productivity during the past decade was low in the first few years but showed an obvious increase in recent years (Table 1).

Table 1 Total article included in bibliometric analysis in the field of waterpipe tobacco smoking by publication year
Full size table

The retrieved documents were published in 162 peer-reviewed journals. Table 2 shows the 10 top journals in which waterpipe tobacco smoking related articles were published. Nineteen documents (5.7%) were published in Nicotine and Tobacco Research whereas 11 (3.3%) were published in Tobacco Control, 11 (3.3%) were published in Food and Chemical Toxicology, and 9 (2.7%) were published in BMC Public Health.

Table 2 Ranking top 10 journals in which waterpipe tobacco smoking related articles were published based on impact factors
Full size table

All retrieved documents were published from 42 countries. Table 3 shows a list of rankings of the 10 countries whose researchers published the largest number of articles in the field of waterpipe tobacco smoking during the period between 2003 and 2012. When the data were analyzed by country, the largest number of publications in the field of waterpipe tobacco smoking was from the United States of America (USA); (33.5%), followed by Lebanon (15.3%), and France (10.5%); (Table 3). The total number of citations at the time of data analysis (October 18, 2013) was 4,352, with an average of 13 citations per document and a median (interquartile range) of 4.0 (1.0–16.0). The highest median (interquartile range) number of citations was 30 (6–55) for Syrian Arab Republic (SAR), followed by 11 (3–35) for Lebanon. The h-index of the retrieved documents was 34 (i.e., 34 documents had been cited at least 34 times at the time of data analysis). The highest h-index was 27 for the USA, followed by 20 for SAR and Lebanon. Furthermore, the highest number of collaborations with international authors for each country was held by the USA, with 58 documents, followed by 31 documents for the SAR and 24 documents for Lebanon (Table 3).

Table 3 The top 10 ranking of the most productive countries that published the largest number of articles in the field of waterpipe tobacco smoking during the period from 2003 to 2012
Full size table

Table 4 presents the areas of interest of the scientific articles. Medicine was the most researched topic, represented by 268 (80.2%) articles. The second most researched topic was pharmacology, toxicology and pharmaceutics by 38 (11.4%) followed by biochemistry, genetics and molecular biology for 27 (8.1%) articles and environmental science for 23 (6.9%). Table 5 shows the top 10 most productive institutions in the field of waterpipe tobacco smoking. The most productive institution was American University of Beirut, Lebanon (13.2% of total publications), followed by Virginia Commonwealth University, USA (9.6%), and Syrian Center for Tobacco Studies, SAR (8.7%).

Table 4 Ranking the top 10 areas of interest of the published papers worldwide in the field of waterpipe tobacco smoking during the study period
Full size table
Table 5 Ranking of the top 10 highly productive institutions in the field of waterpipe tobacco smoking during the study period
Full size table

Discussion

Reducing waterpipe smoking-caused morbidity and mortality worldwide requires an understanding of how various countries have progressed in waterpipe tobacco smoking scientific research. Such an understanding is instrumental for the development of an effective plan to respond to this progress and garner public and political support for it[31–33]. This study was limited to 334 documents extracted from Scopus, bearing article titles with terms related to waterpipe tobacco smoking and, therefore, cannot be generalized to the waterpipe tobacco smoking literature covered by other databases such as Google Scholar. Although the number of citations for each publication might differ from one search engine to another and hence the final results would differ by database selected, the Scopus search engine remains one of the best available databases for analyzing and tracking citations and comparing citations to different research groups and different institutions[11]. A study that compared Scopus, Google Scholar, PubMed, and Web of Knowledge found that PubMed is considered an important resource for clinicians and researchers, while Scopus offers the capability for citation analysis and covers a wider journal range[11, 34–36].

The total number of documents related to tobacco obtained by entering only the words “tobacco or smoking” in Scopus search engine as an article title without specifying the name of any country was 36,407 documents. This number is limited to these terms and represents the total global research productivity in tobacco or smoking during the past decade (unpublished data). Only 334 (0.91% of the total global research productivity in tobacco) documents in the field of waterpipe tobacco smoking were retrieved. These findings indicate that waterpipe tobacco smoking has not been extensively studied as cigarette smoking.

Although waterpipe use is spreading and millions of current waterpipe smokers are found across the world, there has been surprisingly little research addressing tobacco smoking using a waterpipe[37]. All these findings support the need to conduct more research on waterpipes, the issues related to their use, and to distribute the information on their health risks to all countries.

In the present study, bibliometric indicators were used to describe worldwide research output in the waterpipe tobacco smoking field during the last decade. Based on the authors’ knowledge, this is the first article to analyze the quantity of waterpipe smoking-based research from around the world. Research indicators showed that research activity in this field was neglected and was only restricted to 42 countries. This paper also adds to the emerging bibliometric literature within tobacco research. The total publications found in Scopus between 2003 and 2012 showed a yearly increase. Waterpipe tobacco smoking research productivity has followed the general explosion in scientific productivity observed in the last decade and especially in recent years[14, 16, 17]. Our study showed that there were some countries, such as the USA, Lebanon and France, where the total waterpipe tobacco smoking research productivity during this 10-year period was clearly higher than in the other countries. Therefore, it would have been more interesting to know how the growth of tobacco research in these countries differed in quality rather than in quantity, as shown by the h-index. It was observed that countries such as the USA, Lebanon, and SAR demonstrate high h-index values. The number of articles with international collaborations from these countries was high.

We reported that contributions from the outside of the USA appeared to increase steadily during the period of study. Specifically, the current data indicate that Lebanon, SAR, Jordan, Egypt and Iran have been the major research contributors from the Middle East. The top ten countries in the field of waterpipe tobacco smoking publication productivity are different from familiar nations for other scientific productivity ranking[38].

To the best of our knowledge, this study is the first of its kind to obtain initial data regarding worldwide publication productivity in the waterpipe tobacco smoking field from the Scopus database, a database that is used to evaluate the performance of institutes and their members. This study is not without limitations, most of which are the same as those of studies performed in other biomedical fields[30, 39]. First of all, we used Scopus criteria for including waterpipe-related keywords in our study. Articles published in non-Scopus-cited journals were not included, although they would likely contribute to scientific productivity. Another limitation is that some articles did not point out waterpipe and related terms in article titles; however, these terms were mentioned throughout the text. Therefore, it is possible that the number of publications analyzed in this study did not exactly represent all waterpipe smoking-based research activity. Finally, it should be noted that research output for certain institutions could have been under-estimated because of writing their English names differently in different articles. Therefore, such institutions might have 2 or more author profiles in Scopus because their names were written differently in different articles.

Conclusion

The present data reveal a promising rise and a good start for research activity in the field of waterpipe tobacco smoking. More effort is needed to bridge the gap in waterpipe smoking-based research and to promote better evaluation of waterpipe smoking, risks, health effects, or control services around the world.

Abbreviations

SPSS:

Statistical Package for Social Sciences

SAR:

Syrian Arab Republic

ISI:

Institute for Scientific Information

EMR:

Eastern Mediterranean Region

SCR:

Standard Competition Ranking

USA:

United States of America

JCR:

Journal Citation Report

IFs:

Impact factors

IRB:

Institutional Review Board

Q1-Q3:

lower quartile – upper quartile

WHO FCTC:

World Health Organization Framework Convention on Tobacco Control.

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Authors and Affiliations

  1. Poison Control and Drug Information Center (PCDIC), College of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine

    Sa’ed H Zyoud

  2. Department of Pharmacology and Toxicology, College of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine

    Sa’ed H Zyoud & Waleed M Sweileh

  3. WHO Collaborating Centre for Drug Information, National Poison Centre, Universiti Sains Malaysia (USM), Penang, Malaysia

    Sa’ed H Zyoud

  4. Department of Clinical and Community Pharmacy, College of Medicine and Health Sciences, An-Najah National University, Nablus, Palestine

    Samah W Al-Jabi

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The authors declare that they have no competing interests.

Authors’ contributions

All authors were involved in drafting the article, and all authors approved the final version to be submitted for publication. SZ conceived of the study conception and design, organized and supervised the data collection, and provided analysis, interpretation, and writing. SA and WS participated in the study design, and provided critical revision of manuscript for important intellectual content.

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Zyoud, S.H., Al-Jabi, S.W. & Sweileh, W.M. Bibliometric analysis of scientific publications on waterpipe (narghile, shisha, hookah) tobacco smoking during the period 2003-2012. Tob. Induced Dis. 12, 7 (2014). https://doi.org/10.1186/1617-9625-12-7

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Keywords

Tobacco Induced Diseases

ISSN: 1617-9625

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