Negative results and impact factor: a lesson from neonatology.
Arch Pediatr Adolesc Med
; 159(11): 1036-7, 2005 Nov.
Article
em En
| MEDLINE
| ID: mdl-16275793
ABSTRACT
OBJECTIVE:
To test the hypothesis that articles with negative results are more likely than articles with positive results to be published in journals with lower impact factor. DESIGN ANDSETTING:
We selected all of the randomized, placebo-controlled trials conducted during the neonatal period between October 1, 1998, and October 1, 2003. Trials were classified as having positive results or negative results (significant or no significant difference, respectively). Only studies dealing with primary outcomes (efficacy) were included. MAIN OUTCOMEMEASURES:
The impact factor of each journal was determined, and the sample size for each study was noted.RESULTS:
There were 233 articles that fulfilled the inclusion criteria. There was a significant difference between the 2 groups in terms of impact factor (P = .03) but not sample size (P = .30). Impact factor correlated with both sample size and the type of study results (positive results vs negative results; P<.05).CONCLUSION:
Articles with negative results are more likely than articles with positive results to be published in journals with lower impact factor.
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Eixos temáticos:
Pesquisa_clinica
Base de dados:
MEDLINE
Assunto principal:
Publicações Periódicas como Assunto
/
Ensaios Clínicos Controlados Aleatórios como Assunto
/
Viés de Publicação
/
Neonatologia
Tipo de estudo:
Observational_studies
Limite:
Humans
/
Newborn
Idioma:
En
Ano de publicação:
2005
Tipo de documento:
Article