Assessment of publication bias in meta-analyses of cardiovascular diseases.

Abstract:

OBJECTIVE:To examine variables related with publication bias assessment in a sample of systematic reviews with meta-analysis on cardiovascular diseases. DESIGN:Systematic review of meta-analyses. SETTING:Journals indexed in Medline and the Cochrane Library. STUDY POPULATION:225 reviews with meta-analysis published between 1990 and 2002. DATA COLLECTION:Data from meta-analyses were gathered according to a structured protocol. The outcome was the assessment, not the existence, of publication bias by the original authors. RESULTS:Publication bias was assessed in 25 (11.1%) reviews, increasing with time: from 3.4% before 1998 to 19.0% in those published in 2002. A stepwise logistic regression model included several variables increasing the assessment of publication bias: number of primary studies (>7 compared with or=4 compared with <3, OR=8.58, 95% CI=1.73 to 42.62), to be a meta-analysis on observational studies (OR=3.60, 95% CI=1.04 to 12.49), and year of publication (2002 compared with <2000, OR=5.73, 95% CI=1.16 to 28.36). In reviews published in the Cochrane Library publication bias was less frequently assessed (OR=0.06, 95% CI=0.01 to 0.69). CONCLUSIONS:The frequency of assessment of publication bias in meta-analysis is still very low, although it has improved with time. It is more frequent in meta-analyses on observational studies and it is related to other methodological characteristics of reviews.

authors

Palma S,Delgado-Rodriguez M

doi

10.1136/jech.2005.033027

keywords:

subject

Has Abstract

pub_date

2005-10-01 00:00:00

pages

864-9

issue

10

eissn

0143-005X

issn

1470-2738

pii

59/10/864

journal_volume

59

pub_type

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