Journal of clinical epidemiology
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Review Meta Analysis
Systematic reviews of low back pain prognosis had variable methods and results: guidance for future prognosis reviews.
Systematic reviews of prognostic factors for low back pain vary substantially in design and conduct. The objective of this study was to identify, describe, and synthesize systematic reviews of low back pain prognosis, and explore the potential impact of review methods on the conclusions. ⋯ There is an immediate need for methodological work in the area of prognosis systematic reviews. Because of methodological shortcomings in the primary and review literature, there remains uncertainty about reliability of conclusions regarding prognostic factors for low back pain.
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To study variations in the number of times trials of nicotine replacement therapy (NRT) were cited, and which characteristics of trials predicted the number of citations and the impact factors of journals in which articles were published. ⋯ Citations were biased toward trials with positive results and toward trials published in high-impact-factor journals.
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Changing author counts in five major general medicine journals: effect of author contribution forms.
Objective and indirect evidence was used to determine whether required author contribution forms were associated with a decrease in author counts in four major general medicine journals (British Medical Journal [BMJ], Journal of the American Medical Association [JAMA], Canadian Medical Association Journal [CMAJ], and the Lancet). The number of authors listed per article before and after the introduction of explicit author contribution requirements were counted and compared with that found for the New England Journal of Medicine (NEJM) that did not require such disclosure. The primary hypothesis was that author counts decreased more in the BMJ, CMAJ, JAMA, and the Lancet after introduction of the rules than they did in the NEJM. ⋯ Based on the presented objective and indirect evidence, required author contribution forms were not associated with a decrease in author counts.