Number of published systematic reviews and global burden of disease: database analysis

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Abstract
Systematic reviews are key to implementing evidence based medicine.1 We wondered if the reviews done to date are related to the burden of disease from various conditions. Ideally, evidence should be prioritised for diseases with the greatest global impact. We estimated Spearman correlations between the number of systematic reviews in two important databases (the Cochrane database of systematic reviews (CDSR) and the database of abstracts of reviews of effects (DARE)) and the burden of disease (globally and in established market economies) across disease categories. We also estimated the burden of disease for each available review measured in disability adjusted life years (DALYs).2 3 We used 1990 estimates of burden of disease because studies included in systematic reviews would have responded to recent past health needs. Results with estimates from 2000 were similar. We categorised tar geted diseases in 923 reviews from the CDSR and 1899 reviews from the DARE in issue 4, 2000, of the Cochrane Library using 20 categories of the global burden of …