Scientific meetings are intended to gather clinicians, researchers and even patients together, allowing the sharing of ideas to contribute in professional network. Also, meetings enable researchers to share their works with their peers and experts from the field. Oral and poster presentations are the most common forms in this regard. Abstracts can be described as the first fruits which a researcher gets, but unless they become full-text publications, their usefulness will be limited. Even though an abstract includes the most important data, only a limited group (the participants of the congress or the ones who can reach to the abstract book) would be aware of it without a full-text publication. Also, it was advocated that abstract to full-text rate shows the importance of the congress in the related field.(2)
The presented abstracts in EULAR 2009 were archived in The European League Against Rheumatism Abstracts2ViewTM site.(5) We screened this site and included all the abstracts related to pediatric rheumatology in the study. We chose the year 2009, because it was advocated that five-years was a suitable time to show the full-text publication rates of the previously presented abstracts.(4)
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Two researchers searched the titles and authors of the abstracts in Pubmed,(6) Web of Science,(7) and Google Scholar(8) databases. We resolved the discrepancies in search results by a consensus with a third researcher as aforementioned. We sought potential articles firstly by searching for the title and first author of the abstract. If we found no corresponding article, we repeated the search up to five times in each database using alternative authors and key words. We retrieved all the possible full-text publications and verified the concordance between the information contained in the presented abstract and full-text publication to ensure that they represent the same body of work.
We noted four abstracts having full-text publication date prior to the EULAR 2009 Congress and considered their publication time as zero. The elapsed date between the presentation in EULAR 2009 and the full text publication was median 19 months (range, 0 to 64 months).
Juvenile idiopathic arthritis was the most studied disease in the abstracts (n=112) and the full-texts (n=49), followed by systemic lupus erythematosus (10 abstracts and 5 full-texts). The disease types in the abstracts and full-texts are given in Table 2.
Italy (34 abstracts), United Kingdom (21 abstracts), Germany (20 abstracts), Turkey (14 abstracts), and Brazil (13 abstracts) were the top five countries according to abstract presentation. Italy (17 full-texts, 50%), United Kingdom (10 full-texts, 48%), Brazil (8 full-texts, 61.5%), Turkey (8 full-texts, 57%), and Germany (8 full-texts, 40%) were also the top five countries according to full-text publication.
Even though EULAR is considered as an European Congress, following countries outside of the Europe (including Brazil which was among the top five countries) were found as contributors to EULAR 2009 in terms of pediatric rheumatology: Japan with seven abstracts (full-text ratio: 57%), USA with six abstracts, Canada with three abstracts (full-text ratios: 100%), Argentina with three abstracts (full-text ratio: 0%), India, Saudi Arabia and Singapore with one abstract (full-text ratios: 100%), and Morocco and Egypt with one abstract (full-text ratios: 0%).
Thirty-five abstracts (17.7%) were presented orally, while 163 abstracts (82.3%) were presented as poster form. While 12 orally presented abstracts (34%) became full-text articles, this rate was 45% (74 abstracts) for poster presentations. There was no significant difference between abstract to full-text time according to presentation type as oral=19.5 months (range, 0 to 61 months) vs poster=19 months (range, 0 to 64 months) (p=0.832).
It was advocated that full text publication rates after a congress indicate the scientific value of the congress.(4) Scherer et al.(10) reported full text publication rates of medical abstracts as 44.5% in their Cochrane review. We found that the publication rate of pediatric rheumatology related abstracts in EULAR 2009 almost reached this rate. Therefore, it can be suggested that even though EULAR is a general rheumatology congress, it is a beneficial meeting for all attendees engaged in pediatric rheumatology.
However, Yilmaz et al.(11) found the publication rate of all abstracts presented in EULAR 2008 as 34.7%. According to our results (43.4%), publication rate of abstracts related to pediatric rheumatology was higher than general full-text publication rates of EULAR. Several reasons can be accounted for this difference. First, Yilmaz et al.(11) conducted their investigations three years after the congress, while we evaluated a five-year period after the congress. This difference in time may have caused the difference in publication rates. Second, their study included all oral and poster abstracts and therefore studies with less chance of publication could be included into the analysis. It was reported that the publication rate of allied health topic abstracts such as psychology, education, and physical and occupational therapy was only around 10%.(3)
It was reported before that presentation type might have an impact on full-text publication rate and oral presentations might be favorable in the process of full-text publication.(12) However, in the present study, publication rate was higher in the poster presentations (45% vs 34%). Most of the abstracts (82.3%) were presented in the poster form in EULAR 2009 and this may have had an effect on full-text publication rate. Also, there were some orally presented abstracts, such as patient experiences or project advertisements, which were not intended for a full-text publication.
The first journal where the highest number of full-texts were published was the Journal of Rheumatology, as Hashkes et al.(3) reported. Although the official journal of EULAR is Annals of the Rheumatic Diseases, this journal ranked in second place according to publication rates following the Journal of Rheumatology. In the previous reports of adult rheumatology congresses, Arthritis and Rheumatism (it has been divided into two independent journals as Arthritis & Rheumatology and Arthritis Care & Research) ranked in first place in terms of publication rates.(11,12)
Searching the full-texts in the journals using in PubMed, Web of Science and Google Scholar could be counted as a limitation, due to not all the journals were indexed in these databases. This could affect the results.
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