funnel plot

funnel plot

a graphic method of detecting publication bias. The estimate of risk derived from a set of epidemiologic studies used in a metaanalysis is plotted against sample size. If there is no publication bias, the plot is funnel-shaped; if studies giving significant results are more likely to be published than negative studies, the plot is asymmetric.
See also: metaanalysis.
Farlex Partner Medical Dictionary © Farlex 2012
A scatterplot of treatment effect against a measure of study size used primarily as a visual aid for detecting bias or systematic heterogeneity. A symmetric inverted funnel shape is seen in ‘well-behaved’ data for which publication bias is unlikely and which is thus suited for inclusion in a meta-analysis. An asymmetric funnel indicates a relationship between treatment effect and study size, due either to publication bias or a systematic difference between smaller and larger studies—‘small study effects’
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

fun·nel plot

(fŭn'ĕl plot)
A graphic method of detecting publication bias. The estimate of risk derived from a set of epidemiologic studies used in a metaanalysis is plotted against sample size. If there is no publication bias, the plot is funnel shaped; if studies giving significant results are more likely to be published than negative studies, the plot is asymmetric.
See also: metaanalysis
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
2011 1.90 [1.05, 3.42] Total (95% CI) 1.29 [0.86, 1.94] Total events Heterogeneity: [r.sup.2] = 0.18; [chi square] = 50.25, df = 4 (P < 0.00001); [I.sup.2] = 92% Test for overall effect: Z = 1.23 (P = 0.22) FIGURE 3: Forest plot and funnel plot of overall colostomy rate.
The safety and efficiency of surgery with colonic stents in left-sided malignant colonic obstruction: a meta-analysis
The symmetry of the funnel plot was further evaluated by Egger's linear regression test.7 Statistical analysis was undertaken using the program STATA 11.0 software (Stata Corporation, Texas).
XRCC1 Arg280His polymorphism and glioma risk: A meta-analysis involving 1439 cases and 2564 controls
The Funnel Plot Indicates That the Results Were Not Asymmetrical.
The Effects of Intravenous Dexmedetomidine Injections on IOP in General Anesthesia Intubation: A Meta-Analysis
A funnel plot was used to examine publication bias.
Efficacy of Mild Hypothermia for the Treatment of Patients with Cardiac Arrest
The funnel plot was applied to estimate the publication bias.
Serum Sclerostin Levels in Patients with Ankylosing Spondylitis and Rheumatoid Arthritis: A Systematic Review and Meta-Analysis
A funnel plot was performed to assess for publication bias.
Pentoxifylline is efficacious in treatment of lower extremity venous ulcers. (Patient-Oriented Evidence that Matters)
Publication bias of the included articles was assessed using Begg's funnel plot. The results of funnel plot showed that the shape of the funnel plot seemed symmetrical (Figure 4) and did not show an obvious publication bias for rs2856718 or rs7453920 polymorphism.
Relationship between HLA-DQ Gene Polymorphism and Hepatitis B Virus Infection
Publication bias is usually evaluated visually with a funnel plot, which is a simple scatter plot of the intervention effect estimates of individual studies against some measure of each study's size.
Effects of Continuous Positive Airway Pressure on Cognitive Deficits in Middle-aged Patients with Obstructive Sleep Apnea Syndrome: A Meta-analysis of Randomized Controlled Trials
The existence of publication bias was initially checked by the graphical display of funnel plot and then test by the Egger's.13,14
Diabetes in Pakistan: A systematic review and meta-analysis
Funnel plot and Egger's linear regression tests were conducted to evaluate potential publication bias.
Diagnostic Performance of Intestinal Fusobacterium nucleatum in Colorectal Cancer: A Meta-Analysis
Publication bias was assessed visually using a funnel plot and was tested formally by Egger's test, with p<0.10 indicating the presence of publication bias [13].
Effect of direct-fed microbials on culturable gut microbiotas in broiler chickens: a meta-analysis of controlled trials
An interpretable funnel plot should be based on at least 10 studies (Sterne et al., 2011), applying only to five of the results in Table 2.
Parenting Behaviors and the Weil-Being of Children With a Chronic Physical Condition
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