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. Author manuscript; available in PMC: 2020 Sep 1.
Published in final edited form as: Lung Cancer. 2019 Jul 6;135:205–216. doi: 10.1016/j.lungcan.2019.06.024

Appendix B.5: Contour-Enhanced Funnel Plots to Assess Publication Bias of Smoking Cessation Interventions from a Random Effects Meta-Analysis by Intervention Type.

Appendix B.5:

Funnel plots compare the effect estimate of a study to some measure of its precision. Larger more powerful studies are placed at the top and smaller less powerful studies are at the bottom. Contour-enhanced funnel plots add areas of statistical significance to aid in the identification of areas of significance or non-significance from which studies appear to be missing.